[Hallicrafters] A question on set screws

[Waldo Magnuson]

    I was wondering if anyone (everyone) replaces Bristol set screws 
with Allen set screws when the need arises to replace the set screws.  
I've had three or four Bristol screws break into fragments when 
removing them but have always just replaced them with the easily 
available 6-32 Allen screws.  Is there a source for Bristol set screws? 
  Just wondering.
73,  Skip  W7WGM