[Collins] 75A-4 Dial Spline Lock Nuts

[Joe Eide]

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



Jim Walker wrote:
> Still working on the 75A-4.  I encountered a problem I have never had
> before and really need some experience.  I set the end points on the PTO
> but went to center the dial but cannot get the spline lock nuts loose.
> I have the XCELITE 99 spline set.  The set screws take the #99-62 pieces
> and the inside of the lock screws are in good condition.  I have removed
> the front panel for cleaning and have good access.  To date I have
> managed to twist the spline wrench into a noodle.  I even shortened it
> with a cut off wheel to increase the torque.  I've tried ACETONE.  I
> haven't tried heat as I can't get my solder gun down to the shaft and am
> afraid I'll damage the dial.  
>
>  
>
> To date there is no damage but no movement (n pun intended) on this
> problem.  I really need some suggestions.
>
>  
>
> Jim 
>
> KZ5AW
>
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