I took mine apart as the current draw was just slightly above spec,cleaned everything up with brake cleaner oiled the bearings for the motor the best i could without removing the armature put lubriplate on the gears and reassembled.The current draw dropped from195ma before cleaning to 150ma after which is mid range in spec.the "rivets" are actually part of the casting just squashed over on the end,i was able to cut the head off them with a sharp wood chisel and there is no reason to be concerned about putting them back as i seems their only purpose was to discourage disassembly and perhaps for alignment which they still do with the heads trimmed off. My $.02 Don

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Red Green "This is only temporary,Unless it works!"

97 E300D 157000 miles
87 300TD ?141k? miles