Good morning Vic,
First suggestion is that if the wrenches are turning to no effect you
have the wrong size (SAE vs. Metric). This is easy to correct.
Second suggestion is you stripped the setscrews ... not so good, but
still workable.
If you have stripped the setscrews, take the proper sized hex wrench,
dip the end in water, and then roll it in some dry scrubbing powder
(Ajax, Comet, etc). Then firmly apply pressure while turning. BTW, this
works on stripped Phillips head screws as well. Just remember to discard
the removed screws and clean your hex wrench.
If you find you were using the wrong size hex wrench, and you can't turn
anything, heat the business end of the hex wrench (100°C or so) ... you
may want to use pliers to hold the wrench. When hot, insert the hex
wrench into the setscrew and let it sit for about 30 seconds. This will
heat the locking compound sufficiently to help break it free. Then,
loosen. Repeat as necessary.
If the threadlock used was Loktite Red, it will take localized heat
greater than 550°F (287.778°C).
For reference: "Most thread-locking formulas are methacrylate
<https://en.wikipedia.org/wiki/Methacrylate>-based and rely on the
electrochemical activity of a metal substrate to cause polymerization
<https://en.wikipedia.org/wiki/Polymerization> of the fluid.
Thread-locking fluid is thixotropic
<https://en.wikipedia.org/wiki/Thixotropic>, which allows it to flow
well over time, yet still resist shocks and vibrations. It can be
permanent or removable; in the latter case, it can be removed with heat,
for example. Typically, brands are color-coded to indicate strength and
whether they can be removed."
Hope this helps.
73,
Rick
NM3G
Vic wrote (in part)
... but I can't budge the setscrews holding the old one. Allen wrenches
twist to no effect.
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