If you don't want to deal with wet and oily you could always opt for graphite on slider type machines. Swash bearings are almost identical to skateboard bearings...I am not sure what race design is used inside their bearing though, if it's the typical metal cage design like in skateboards or the plastic type. Either way any type of lubricant oil should be o.k. I'd avoid anything light like wd-40 though, it would make the grease they are packed with break down and run out making a nasty mess.