[R-390] Fundamental question - setscrews

[Mike A]

On Wed, Nov 14, 2012 at 09:45:27AM -0800, John Saxon wrote:
> Another simple question...
> 
> Straightforward goal:  remove a knob
> 
> Problem: Bristol setscrew appears to be welded to the control shaft.
> 
> How to loosen it up?
> 
> I am afraid to twist any harder for fear of breaking my Bristol wrench.
> 
> Suggestions?

Apply a drop of penetrating oil, wait a few hours, try again? 

If that still fails, then try alternating these:
o   touch a hot soldering iron to the setscrew long enough to heat-soak
    the metal; then
o   spray the setscrew with some freeze spray or other -- say canned
    air, upside down.
The idea is to try to break it free using thermal expansion and
contraction.

-- 
Mike Andrews, W5EGO
mikea at mikea.ath.cx
Tired old sysadmin