OK, I just went through this.
Bought a 42mm PO on bracelet from Joshua, with a week the mushroom pin and rivet that hold the pin in position within the clasp came apart. It's a 2 part pin. I was advised by members to JB Weld the pin and rivet into the clasp.
Joshua (no questions asked) graciously sent me a whole new bracelet, problem solved.
Now when I wear the PO I don't put any pressure on the bracelet, don't lift anything heavy.
Also, when closing the clasp I hold the clasp buttons open and shut them when the clasp is closed. This way you are not pushing the clasp shut against the mushroom pin.