I have a procedure for lapping that has me lapping under water. In time I will build something to make it go faster but for now it is all hand lapping. I put the pug in the sink and then a thick piece of umber mat and the the dmt and rub the rock against the dmt while it is under water. If it works out that your sink is at a good height the ergonomics are not bad. In an attempt to find rocks that are not crazy hard I often hit the rocks with a 5lb hammer to check them. I think at this point that mid range and a bevel setter would be my holy grail. I have some recent coarse rock that I have not had the chance to refine, but I am always hopeful.