Winding stem removal from crown
Now, prior to about half an hour ago, the snapped stems I've encountered have either had enough protrusion or the crowns have been toast anyway.
Then some idiot, (Ahem), fumbled a movement he's readying for a strip just after refitting the stem which then encountered floor and snapped the stem flush with the crown thread, removing and replacing the stem from the movement isn't a problem but I would like to, if possible, remove the thread from the crown, (it's a panerai/parnis style wide thin b
I believe Alum is also used in old fashioned razor shaving, to "tighten the skin" and also stop the bleeding from shaving nicks, so you might like to check you local supermarket for Alum shaving stick. Often Asian grocery stores have alum shaving blocks. I presume they are more popular with ex-pat Asian gentlemen of a certain age.