Oiling is also excellent advice particularly if the tumbler is being
started up again after laying idle for several months.
Just don’t get carried away and over-oil the rollers - I once had
someone bring me a Lortone 3A with the complaint that “the barrel is
My “repair” was lightly sponging off about 90% of the oil with paper
towel, reassembling everything so there was no oil in the bottom of
the tumbler case to leave it nice and clean then keeping a straight
face until the customer had left the store after which I went to the
back room and laughed helplessly for the next 10 minutes…
Generally anything more than 3 or 4 drops per bearing is plenty even
if the tumbler has been stored long enough for the oil to dry out.