the top is pointed/rounded, and i've got around 20 of those locks from brand new to several years used, all of them havin either spool Pins as first keypin.
Due to the fact these locks do not have anything to gut them non destructivei guess you can't rekey them but I'm not sure about that.
You can gut it by getting th locking Pins sideways out of the lock:
here ist how one of these (not my work) was stripped and what they found inside.

after knowing that i checked the locks again on most of them one of the spools is in fact a Keypin with rounded tip, few of them having a short keypin above a regular spool-Driver, at least for the first pin in the keyway, guess that's because you have to set the first Pins in those locks quite deep so you havent't got the space to add a even a short Driver-Pin.
guess either the springs are too short or they ar some kind of masterkeyed.