dude. open it up. i was you a few months ago. it's real simple in there. the bearings and shit come apart easy enough. the e50 is simpler than most staplers. do get a proper screwdriver tho. i ground one down to perfection.
and your gonna need a crank sooner or later.
as for pipes....i hear great shit about the 6p. i run a leovince. it's nice. my buddy runs a proma circuit. it goes fast.