If it's a vinyl thumb insert like I use, You basically remove it the same you do a finger insert you just do it carefully.
everybody has their own technique.
It all Depends on how they glued it in, I loosen it up around the top some with my knife and if I can't just pull it out. I see if I can work the blade down the side and break the glue lose or I take small chisel (or screwdriver) split it down the side and twist it out with pliers. Just don't pry against the top of the hole.
If it's a urethane or vinyl thumb slug though, you got to drill it.
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