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bergland

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Reply with quote  #1 
Okay! All you luthiers and mechanical savants out there! I need help. I'm looking at the back of my Megatar and seeing two metal objects that allow a threaded rod to be screwed into the back.

meggrommet.jpg 
I currently attach my MegBar to the Megatar using one of these metal objects. What is the name of this threaded metal object (the one the question mark is pointing to)? I want to have someone install a new one (whatever it is called) higher up on the instrument (see the red X). What kind of a craftsman has the skill and competence to do this? A luthier? A carpenter?

I also want to have one of these objects (whatever they are called) installed on the back of my Warr guitar (see the red X).

warrgrommet.jpg 
How safe is this? Does the body need to be X-rayed? How would I determine the safety of drilling a hole into this spot. Note - There is no point in even trying to contact Mark Warr to ask him this. He is not at home.

Don


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- Megatar Classic, Max Tapper 12-String
- Warr Guitar, Artist 12-String with MIDI
- Chapman Stick, Grand, Satine, Classic
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jdavies

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Reply with quote  #2 
I guess Patrick would know - he might even have installed it on your Megatar in the first place! It looks like a threaded ferrule of some sort. Searching for threaded ferrule led me to this which might be what these look like when not screwed into wood. I don't know what the thread size for the bolt used on the MegBar is though.
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megatar

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Reply with quote  #3 
On a classic Megatar the threaded thing is called a "T-nut" and it is installed from the inside of the control cavity.  Another T-nut could be installed higher up by removing the pick guard assembly and drilling from the outside in (cleaner hole), inserting the T-nut from the inside and securing the T-nut with small screws.  Any qualified luthier could do this or any skilled woodworker with good tools (quality drill press, proper drill bits, etc.) could accomplish this as well.  

Regarding adding the same to your Warr.  You would need to use what is called a "threaded insert"  which would be installed from the back of the instrument.  Threaded inserts come in several different patterns, with the "flanged threaded insert" being most likely to make a good looking installation.  The outside threads on the insert are very coarse and the biggest challenge would be preventing the insert itself from mashing up the hole, but that is what the flange is for.  It would be pretty challenging to add the insert in a way that is consistent with the level of quality of the instrument, but possible for someone with the proper skills, tools and some patient craftsmanship. 

With the bolt on neck on your warr it is unlikely that there is some obstruction or sensitive component right in the area were you want to install the threaded insert.  I have seen some luthiers using metal shim material to adjust the angle and fit of the neck, but I wouldn't expect that on your warr, and depending on the depth and nature of the new installation, would not be an issue anyways.  To be sure it would be ideal to be able to ask somebody with intimate knowledge of the construction of that instrument.

I am right now experimenting with doing exactly what you describe to the new Megatar design (no large front side control cavity), that is, installing threaded connection points onto the back of the instrument body. I will keep you posted regarding what processes I develop.
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bergland

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Reply with quote  #4 
Megatar:

I appreciate the information. I'm still hesitant about the act of having these inserts installed on the instruments (especially the Warr), but it is a necessary process of customizing the instruments to fit on a performance stand. I'm getting old and my back is getting fragile. It is hard for me to hold the weight of these types of instruments. The stand, made by Steinberger, is a very solid unit which would allow the instrument to be firmly held during play. All that is needed is this type of insert. I'll send some pictures of the project as soon as I return to my studio computer.

Don

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- Megatar Classic, Max Tapper 12-String
- Warr Guitar, Artist 12-String with MIDI
- Chapman Stick, Grand, Satine, Classic
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TxTouchStylist

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Reply with quote  #5 
What Steinberger stand are you using ? I'm using the Steinberger tripod stand on my Megatars and find it to be perfect for both sitdown and standup playing, almost infinite adjustability in height and angles. The bolt on the stand fitting is too long and requires a spacer to go between the stand fitting and the Megatar, the bolt is the right thread size. I made one sample of my SteinMeg spacer and can provide a mechanical drawing if you'd like one.
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