Just replaced the thumbstuds on 3 Hogue Dekas in Magnacut today. Two of them are SMKW limited exclusives (the SubZero and Scorpion which are no longer on website) and one regular Magnacut whose cheap original polymer scales I had replaced with Blue Linen Micarta from RC Bladeworks. So I was very eager not to ruin the knives in the process! Happily, with due care, no damage or marks were inflicted on the knives.
The replacement studs for the Benchmade Bugout fit perfectly, although they appear smaller than the Deka's original thumbstuds because the Bugout's studs are more of a tapered cylinder shape with the tops smaller than the bases. The Deka's thumbstud holes on the blade appear to be too big, but once you get the replacement studs properly screwed in (with loctite) and centered, they don't move.
The best way to remove the thumbstuds is to use a narrow tipped channel lock plier to unscrew the female end of the thumbstud (on the right side of the blade with tip facing forward). You will have to turn it counterclockwise a few times before it loosens (it is red loctited in). Once you get it off, put a small drop of acetone (nail polish remover) in the hole of the blade and let it soak there for about 5-10 minutes. That will loosen the red loctite holding the other side on. Then take the channel lock plier and grip the remaining thumbstud and wiggle it back and forth till it pops off.
The newer replacement thumbstuds are lower profile, less abrasive, and better looking. A worthwhile replacement IMHO.