I took apart my 'First ' BP clone upper head assembly, to repair the in-out lever for the back gear. Someone rebuilt it and put grease on the back gear and pinion. Since there is an oiler there, I wanted to be sure that these gears were meant to be oiled, not greased. I repaired the in-out lever, (the rebuilder reassembled it wrong) and now am ready for complete reassembly. Should I remove the grease before I reassemble?