I used white lithium grease. The instructions from Bally do actually say the rollers are supposed to be greased, but I believe it says to use teflon grease. IMO, any place you have metal to metal contact like that should be greased. Some people will probably argue that in HUO setting it's not needed, but I'd rather clean up some gunk later on, than cleaning up metal shavings out of the cabinet or trying to source a replacement bracket.