Try using the "straw" attachment on a can of carburetor cleaner to squirt solvent into the hole in the oiler pipe, followed by air pressure from a blow gun. You might get it unplugged without having to do a bunch of disassembly.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!