[Collins] 75A-4 Dial Spline Lock Nuts

[Dr. Gerald N. Johnson]

On Tue, 2006-06-27 at 10:55 -0500, Joe Eide wrote:
> Jim,
> 
> Here is what I do:
> 
> Take an extra bristol wrench and heat up with a torch until if is very 
> hot.  Insert hot tool into set screw and hold for a few moments.  Pull 
> hot wrench out and insert cold (normal) bristol wrench and it should now 
> come loose.  The heat will loosen the Glyptol.  If it doesn't work, 
> repeat.  Be very careful not to bump the dial or other items that may melt.
> 
> Good luck.
> 
> Joe - KB9R
> 
> 
I'm not sure what they use. Probably blue Glyptol, maybe red Glyptol
(kind of a terra cotta color), or green lacquer. Many a set screw
anchored in Glyptol has remained anchored despite strong attacks. My dad
and I rewound some generators to alternators and used red Glyptol.
That's really tough stuff that is quite permanent whether on a winding,
a set screw, on skin, or on clothing.

-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer