[modeleng] Nitrile Balls

All,

On a couple of occasions recently I have had injectors fail, only to 
find that when I dismantle the clack the nitrile ball is firmly wedged 
in the seat.

Now this size of nitrile ball has worked successfully for years 
previously, so size isn't an issue!

Has anyone else had this problem?  Should nitrile balls be changed on a 
regular basis?

Cheers

Peter
Tinkerbell
Bagnall x 2

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