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I recently acquired a 10 year old Cube Acid MTB which I intend to refurbish and convert to an ebike.
I need to remove the crankset and purchased a crank puller.
It seems to be a universal size but the "internal" bolt which should push against the bottom bracket spindle to release the crank arm seems too thin, and just slots straight inside the bottom bracket hole.
(Click images for larger views)
Are there other sizes/types of crank puller?
The issue seems to be that what is considered "universal" changes over time. The OP seems to have a crank puller that is universal for square-taper bottom brackets.
The photo looks like a splined hollow bottom bracket spindle, so maybe Octalink I? (not to be confused with Octalink II/Hollowtech). There are Octalink/ISIS-specific puller tools (now harder to find) e.g. the Park Tool CCP-44 Crank Puller. The difference seems to be not with the threading, but rather having a larger-diameter "pusher" end that seats on the hollow spindle's end rather than just going inside.
Apparently current "universal" crank pullers include such an alternate pusher end and "universality" is restored :)
Example only photo of a crank puller with two alternate pusher inserts:
