More on catches

Jewelry Discussion
1

What to do when the little thingy that moves in the catch falls out?
Most recently that happened on a piece that I cannot re-heat. Has
anyone had luck in replacing it with one taken out of a good catch?
Any other ideas? Thanks Sandra

2 
   What to do when the little thingy that moves in the catch falls
out? Most recently that happened on a piece that I cannot re-heat.
Has anyone had luck in replacing it with one taken out of a good
catch? Any other ideas?

Hi Sandra, I’ve replaced a number of the roller catch centres. I’ve
learnt to only push the two sides out just enough to get the new
piece in, because if you open it out too much the sides seem to lose
their tension. Like most things there is a knack to it. Good Luck,
Christine.