Because the plastic was not suitable for the purpose it was being put to.  
I'm sure I  read something about a bad 'batch' of such points in circulation 
recently.  I would return them and ask for a refund.  A very long, long time 
ago 
I had a similar problem with Microdynamics blue points that kept closing up 
the gap for the very same reason.  Not long after that I switched to electronic.
Regards
Daniel1312
In a message dated 01/10/03 19:28:36 Pacific Daylight Time, 
spritenut@Exit109.com writes:
> The red plastic cam follower was melted away.
> Why?
 
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