I have a Thun (?) crankset and bb on the bike I'm fixing up and I'm having trouble getting the cranks off. I have a crank puller (not sure what model) that works on my Shimano Sora cranks on my cross bike but won't fit this bike. There is dustcap on these cranks...the fixing bolt is the only thing so there is no way to screw the puller in. The other part of the crank puller is too large to screw into the inner piece.

Are there different sized crank pullers out there? What size should I be looking for?