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Scissor Jack

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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.


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.

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4.5
  • 4.44 average rating from 16 reviews
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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


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..

5.0

For critical work inside the box this jack is the tool for the job.

By

Verified Buyer


I had back braces to reglue inside both a vintage Washburn parlor and a Gibson B-25 3/4 - both small soundhole and shallow body depth made for very tight working space. My regular jacks wouldn't even collapse small enough the fit atop the back braces.

This scissor jack, with its extension handle, made it possible to reach the middle and last back brace toward the tail with ease, and good visibility.

Well worth the investment for critial work.

5.0

Love the mechanism

By

Verified Buyer


Worth the price for such a well built mechanism.

5.0

Wish I had ordered them before!

By

Verified Buyer


Very nice tool with lots of possibilities in the shop!

5.0

Scissor jack the best

By

Verified Buyer


I used it for acustic guitar top repair. I like this tool! Thank you Stewmac!

4.0

Great Tool,

By

Verified Buyer


Scissor Jack saves a lot of time when working "blind" inside of a guitar, a great idea. A little over priced though.

5.0

Nicely made tool.

By

Verified Buyer


Doesn't get a whole lot of use in my shop, but I don't think there's anything I could use to replace it. Excellent design and execution.

4.0

Works well, but.....

By

Verified Buyer


Just used this for the first time in a position inside an archtop guitar at which the "remote control" extension cable was essential. It worked well but I found that with the "remote control" you can achieve very limited torque/pressure with the jack.

5.0

Very Handy to Have

By

Verified Buyer


I've been trying to get by for years with those turnbuckle-style jacks, but I wanted better control.

This thing is great! I use this on my neck-jig and for proping up tops on acoustics with ease and precision! Wish I could afford a couple more of them.

Showing 10 of 16 Read more reviews >>


StewMac PDF Catalog, page 22 See Scissor Jack
on page 22 of our StewMac Digital Catalog