Hi fellows,

As I said before, I'm servicing a vintage SM300. Of course the stem was broken due to some rust. I'm willing to save that crown because it's unusual. See the narrow logo. Of course I could replace it but it won't be originaL I think that you undestand me you geeks!
There's a tiny part left out of the stem. really small and rusty. What do you suggest. I thought of 2 things. Drilling with a 0,5 mm drill or try Vissin.

 

Religion jokes aside, we need professional advice. Let me put up the Bat Signal: @Archer! Can you give a tip Al?

 

Since the stem is ferrous and the crown is not, you might burn it out with an EDM. Well, not you (nor me!) but an expert.

Tom

 

I agree you should try to save the original crown, but calling everyone geeks might not get you a lot of help.

 

Pretty much anyone capable of giving a correct answer would happily answer to geek.

 

Thought you were putting religion jokes aside?

 

Could the stem be dissolved with an alum solution?

 

You can pay Bergeon for Vissin if you like, but alum from the spice aisle at the grocery store is a lot cheaper...

 

Place and cover completely in a small bowl of white vinegar, cover to prevent evaporation, come back in a week...