Restoring Nylon parts (like the card guides in a PDP-8a chassis)

Jules Richardson jules.richardson99 at
Mon Mar 21 18:25:20 CDT 2016

On 03/21/2016 12:02 PM, Doug Ingraham wrote:
> I was able to restore almost all the unbroken card guides on my 8a.  A
> couple of them had taken on a permanent bend due to excessive shrinkage.
> Some had broken pins.  A few of the pieces expanded too much and you could
> plug them into the chassis but they bowed away from the edge because they
> had lengthened beyond original length.  Waiting a few weeks allowed them to
> dry out a little and shrink and restored them to original size.

Interesting... so boiling them can make them expand too much, leaving them 
for a few weeks will allow them to contract, but they "remember" their 
manufactured size, such that a few weeks after they they aren't trying to 
return to their shrunken, pre-boiled state?



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