Dave's suggestions are excellent; the tape will fix oversanding.
Ed Nagy (Almightysufx) does a neat thing with his custom resin heads: he dremels a slanted groove down along the plug/base, so that the plug can be "screwed" in.
WANTED: RM Robin & P. Parker heads; Batman "waffle" gloves; mint Wolfman tights; Knights', Merry Men, Conan, & Dale Arden swords; Lion Rock (pale) Dracula head;T1 GGoblin body (in good shape but can restring); POTA Soldier Ape minty bandolier; yellow bridle & stirrups; POTA Stallion complete set of tack; Fighting Furies Spanish & Buccaneer outfits & boxed Hook.