I've emailed Archer already. He won't work on reps because of contract's he has in place with genuine companies. He'd lose their catalogs/business touch points etc. Said was happy to work on any genuine watches though. You could always try him again. Here's his site archerwatches.ca
Contact the dealer. More then likely, the dealer will probably ask for it back to fix or replace the watch. Or you could buy a gen crown and tube and do a swap. Its more then likely stripped, which is a problem with the PO's.
Just got my new 5th Gen 42mm PO, and am looking to mod it. This thread helps a lot. Now I just need to get some parts and send to a modder or take the plunge and do it myself...