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Scissor Jack

Scissor Jack

Scissor Jack

Item # 0490
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Scissor Jack

About This Item

Perform repairs where your arm can't reach. Our versatile Scissor Jack lets you perform tricky repairs inside an acoustic guitar with ease.

Magnets make tricky interior alignment easy!
Many hours, a pile of prototypes, and inspiration from luthier Freddie Cisneros, went into the development of our Scissor Jack. There's no other tool to match its versatility and ease of use for interior acoustic guitar repair work:
• Holding braces, repair cleats and bridge plates for gluing
• Aligning the sides of a crack for gluing
• Supporting a fretboard over a guitar body for installing frets
• Simulating string tension on an unstrung guitar top, for accurate bridge saddle work and neck resetting

The Scissor Jack has smooth thumbscrew height adjustment. Best of all, it's easy to add the flexible extension cable supplied with the jack, so you can operate it deep inside the guitar where your arm can't reach!

One more cool feature: it comes with magnets. They help you position the jack and align exterior cauls in lots of versatile ways that make tricky clamping a LOT easier.

The Scissor Jack has sturdy machined aluminum, brass and steel parts for durability and long life in the busy repair shop. The glue-resistant polyethylene cauls are specially recessed for the supplied magnets (the jack can be used with or without the magnets).

Minimum height        2-1/4"        (57.15mm)
Maximum height 4-3/4" (120.65mm)
Caul diameter 1-3/4 (44.45mm)
Magnet diameter 1" (25.4mm)
Extension cable length        10-7/8"        (276.22mm)

Tips for using the Scissor Jack:



Use cauls to help spread the clamping pressure. Here the jack is applying pressure to a soundboard X-brace, while sitting on a caul that spans two back braces.



Here we're using exterior cauls on both sides of the guitar, to give the jack something to push against safely.


Magnets make caul alignment easy. A few examples:



With a steel washer (or magnet) outside the guitar, the jack hangs upside down, ready to hold a crack repair caul in place.



Notice the exterior cauls.



The gluing rig was easy to make; simply a 1/2" repair magnet screwed to a wooden dowel.



Here's a curved wooden caul that matches the curve of the guitar side. It has a magnet attached that holds the jack.


Warning: Seriously strong magnets!
The magnets supplied with our Scissor Jack are made of rare-earth neodymium boride. They can magnetize, degauss, or re-polarize any ferrous or magnetic material, including electric guitar pickups. Keep them away from magnetic storage media such as floppy discs, cassette and video tapes, as well as pacemakers, computers, CRTs, TVs and watches. Keep these magnets out of the reach of children! If more than one magnet is swallowed, they can attach to each other and cause intestinal perforation or blockage, which can be fatal.


CALIFORNIA PROPOSITION 65 WARNING
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.


Video

Trade Secrets!

Trade Secrets!

Video: Gluing a Martin D-35 back brace

This issue of Trade Secrets is a video: Dan Erlewine glues a Martin back brace, using Scissor Jacks along with tools you can make in your own shop. After this video, we developed the Brace Gluing Wedge to simplify this job and reduce the number of tools needed.

Workin' in the soundhole with the scissor jack and a mirror

Dan Erlewine's got a repair that needs repairing again. Working inside the guitar body is too tight for comfort, but Dan shows some tools and tips that make it easier.

Customer Reviews

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4.5
  • 4.58 average rating from 24 reviews
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5.0

Great - with one Issue!

By

Verified Buyer


This is a quality jack and well worth the money! I am very happy with it but I do agree with other reviewers that a set screw on the knob shaft would be a nice addition. It slides off easily and when your hand is inside the guitar this is very frustrating. StewMac could you possibly offer a retrofit knob with a set screw. I would happily purchase one!

5.0

A nice addition to the shop

By

Verified Buyer


Even if I only use it this once, its "visual" will make me look smart many times over :)

5.0

Paid for itself first time out

By


I had an impossible situation on a loose brace on the 4th (deepest) brace on a Blueridge OM. I could not reach the brace at all so I decided to spring some cash for the scissor jack. Was able to complete the job using warmed fish glue and the brass brace gluing wedge dispenser which I also bought. Money well spent and the job paid for both pieces on the first job. Snap! Highly recommend both of these tools. Arcguitar dot com.

5.0

THE perfect tool for warped tops

By

Verified Buyer


Have an Ovation with a very bad case of a warped top due to lose bracing and a poorly glued bridge, and the scissor jack was worked great to get the top close to it's original shape to start making repairs.

5.0

Worth it!

By

Verified Buyer


I have strained and fiddled with modified turnbuckles. This little scissor jack is easy to place and apply just the right pressure for interior work. I held off, thinking it was just too expensive. Well, it is a specialty item, to be sure. So it has to have a higher price to justify its being manufactured. I am glad I bought it.

5.0

A little expensive but a great tool

By

Verified Buyer


used it to glue a brace where a clamp couldn't reach.

4.0

scissor jack

By

Verified Buyer


Over all I was happy with the scissor jack. The magnet system worked well. Only minor complaint is that the black knob falls off easily. A small set screw in its side would be good. The extension handle also falls off if you have to do much moving around. It can be taped on. I also tied a string around the bottom of the jack so you can retrieve it without pulling on the handle.Bottom line is I still think it was worth the price because I had a nightmare repair job that got done, a loose fan brace on the top of a classical guitar behind the bridge. M.D. Matthews St.Petersburg Florida.

5.0

dandy jack

By

Verified Buyer


got way way back to last J-50 brace. paid for itself first use! fantastic!

4.0

Great and usefull little tool!

By

Verified Buyer


We just got our first one to try out, and it works perfect as long as the force needed isn`t too heavy!

4.0

Just needs a set screw for the knobs..

By

Verified Buyer


It would be great if the knobs had set screws to hold them on the shaft. I don't know how many times I have the jack just about in the perfect spot and the knob falls off the shaft and I have to start over..

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