I noticed the other day that the bolts on my front bearing caps were loose. If I snugged them up it locked up the spindle. So I figured I had a shim problem in there. When I took cap off; I found only 1 set of .028 brass shims and some plastic half in place under there. The wicks are packed with crud: and the spindle and bearings have nasty grooves wore in them. Is this lathe junk? can the bearings be replaced? or am I able to clean it up and polish the surfaces up a little bit and would they be ok ?