Heath HDP-121 Desk Mic Case Cracks

[John H. Klingelhoeffer]

I need some comments from successful  experience in mechanically fixing the 
housing for a Heathkit HDP-121  desk microphone.  I am using the HDP-121 
with a Kenwood TS-130S, and  it works quite well, electrically.
 
Unfortunately, there is an expansion snap ring inside the back of the  
microphone element housing that has exerted outward pressure for (at  least!) 30 
years on the thin cast metal case, causing significant cracking in  the 
element housing.
 
Any fix for the fractured casting will probably not survive the expansion  
ring returning after repair to its original position, but I'm not sure the  
ring is really necessary, anyway.  That being said, has anyone  repaired the 
thin casting in the past and have some ideas, or should I just  (ugh!) 
replace it with a piece of plastic tubing or something?  
 
Certainly, with all those HDP-121's out there, this must be a problem  
others have experienced and found a solution for before.   Thanks in  advance 
for your thoughts.
 
73
 
John...
 
 

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