Help all ye Triplanar Gurus

No, you're not losing your marbles Lew. Like Doug, I knew the assembly he was referring to.

It's a tiny set screw, btw, using an .050" Allen wrench.

I suspect that this will have to be helicoil'd. I just checked the McMaster Carr website, and note that stainless helicoils are stocked down to a 2-56 thread size.

Looking at the standard range of set screws, it looks as if the screw in question is a 4-40 (one size larger than a 2-56). I say this because a 4-40 uses an .050 hex wrench.

So, the good news is that the parts exist to do the job.

Cheers,
Thom @ Galibier

Too bad Herb's up in hifi heaven. He could fix it in 10 minutes and yell at you while doing so. Or he would just replace the whole broken part of the tonearm using something he found on his workbench.

I would've assumed as much, that the set screw in question was an Allen Screw.

I would also assume Triplanar provides a compliment of the correct size Allen Wrenches needed for the Arm, correct?

Not to be insulting to our friend here, the original poster, who now has this problem, but I would as well assume Triplanar isn't using Threadlocker, so how does such a thing happen? Did they install the Screw with Gorilla-like force?

I'd probably send the Arm direct back to Triplanar. Even though this could be claimed user-error, something sounds amiss here, that anyone could have difficluty with this, and I'm hoping Triplanar sees this more as being thier fault, if the screw was installed with too much torque, or the threaded Hole was not machined correctly, that one would need such force to lossen, to then strip the Screw. Mark

I just checked further on the McMaster Carr site.

To set the record straight, it's one of two sizes - 3-48 or 4-40. Both sizes use a .050 hex key.

Look at this site: http://www.mcmaster.com/
Search on part numbers: 97705A226 and 92311A089

Cheers,
Thom @ Galibier

Thanks fellas for responding.Thank God its not the VTA screw. That would have been the mother of all audio disasters, from my narrow perspective. Its the small probably no more than 2mm dia screw sitting atop the cylinder which houses the fluid for the cueing platform. I guess I screwed up literally. A small cautionary note in the instruction manual to be careful could have warned a novice like me.
I live in New Delhi, India and its not practical to send the arm anywhere ,not if I want to see it again.
Using the supplied allen hex head screw driver to work on the broken bit have managed to nudge the cueing platform a wee bit lower so its no longer Mt. Everest I am grappling with but a more user friendly mountain. As the broken screw is flush with the surrounding walls there is not enough grip for the allen key but some movement is possible.
Following the excellent advice of knowledgeable A'goners, Doug and Thom, will take the arm to a watch maker who should have the tools to prise out the broken screw bit. The dealer in Singapore has promised to supply the replacement screws. Have asked for spares coz you never know.
Cheers