If you know exactly where you want the stem and won't be moving it,you can fill the void with Loctite bearing mount.It will fill a gap .030 wide and is strong enough to hold a spun con rod bearing in an engine.

But you better know where you want the stem,it will take heat to remove the stem next time.

It's Loctite bearing mount,not threadlocker.

if you want something that's not so permenent,you can put a few wraps of teflon tape around the stem before inserting it,it's real thin and works good on squeeks.