Hi,
I would say you have probably over tightened at some point and the plastic has become worn, I've done it myself... The kit plastic one's are made of a hard compound as appose to the medium flex one's which are made of a lot softer material, however both are fine unless over tightened.
Your best bet is to get a fresh set of arms and start again.
Hope this helps.
Rob
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Schumacher-Racing
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