Quoted from Tuna_Delight:I replaced mine from above. Raised the beast mech manually by pushing up from below the playfield, placed a popsicle stick (on top of the playfield and under the raised beast mech) to hold it in place, removed the playfield flap assembly temporarily, and then removed the two screws attaching the beast.
Reverse the process and the new beast is done.
Rinse and repeat for the other three. Easy peasy lemon squeezy.
Replacing the Beast Heads was not "easy peasy" for me. One really needs patience, 4 shots of Jack Daniel's & a magnetic wand/probe to retrieve accidently dropped spring clips, springs & screws into the beast mechanism.
My approach: Raise playfield to rest on top of front cabinet (it does not have to be tilted back to the back box). From under the playfield, stuff a wash rag or paper towels into the beast mechanism to raise & stabilize it above the playfield. Remove spring clips, springs & playfield flap. Remove the two screws and 2-holed base plate from back of beast head & lift head out. The next step is important to reduce fumbling with individual screws & baseplate: Take the replacement head from LSofG and attach both screws with base plate before inserting it into the mechanism. Screw in the screws about 2mm. Make sure they are oriented straight up & down. Now insert head with limited attached screws & base plate into beast mechanism & finished the anchoring with a small sized wrench. It wasn't until the fourth head (wolf head with recessed back) that I thought of this easier, less time consuming approach. Now, of course, attach playfield flap, springs & clips. Remove wash rag/paper towels from inside beast mechanism & make sure it moves up and down smoothly.
It was interesting to note that after 500+ games (my Hobbit is 4+ yrs. old) the JJP's beast heads showed no damage.