For those who own ZT0301 for a while

I think thumb studs are typically pressed in and mated to the stud on the other side,

Kershaw torsion bars are tested to 10,000 open/close cycles. Some last more, some last less. Their CS is very good or if you prefer torsion bars aren't that hard to replace on your own.
 
Thats what I thought. So next, what is that silver round thing next to the thumb stud in the disassembled pic?
 
That's the Rick Hinderer stabilizer. It prevents the framelock from distending the opposite direction.

Read more about it here.

"it is obviously a overtravel stop..in other words it prevents the accidental overtravel of the lockbar during closing of the knife...some of you have stated that sometimes repeated closings sometimes weakens the lockbar and thus the lockup is not as tight"
 
Yes, the thumbstud is pressed in...but it is one piece, not two. There is a hole drilled to the same diameter as the largest diameter of the thumbstud - just press back into place.
 
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