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Giving your chuck a good cleaning is a great idea! It absolutely cannot hurt if you do it right. One way you could do it, which may or may not be exactly right, is to thoroughly hose it down, inside and out, with WD-40 or something similar. Taking it completely apart and do the hosing down with WD-40 or equivalent is a better way to do it. If you find the internals rusty, even if you didn't see any rust on the outside, complete disassembly and de-rusting is where you need to go. You can use EvapoRust, PB-Blaster, or equivalents, electrolytic rust removal, scrubbing with wire brushes or Scotch-brite pads, vinegar, molasses, Naval Jelly, phosphoric acid, and God alone knows how many other ways there are to remove rust. Clean it, get it thoroughly dry, and oil the pieces with a light machine oil. I have used hydrochloric (aka Muriatic) acid and acetic acid to remove rust, but don't recommend them anymore. Vinegar is acetic acid lots of water, and not nearly as hazardous as the purer acid is.?

WD-40 penetrating oil is NOT a good rust preventative long term, though it is excellent for a short time. Acetone, mineral spirits, Dawn and similar degreasing dish detergents can also be excellent for removing the remnants of the WD-40 after the solvent evaporates. WD-40 will remove grease and oil that has turned to varnish. Electrolytic rust removal will remove rust, paint, and if you connect the anode and cathode incorrectly, the iron itself. Be careful! Also don't ask how I know. ;)

Chemists used to (may still do) rinse glassware with distilled water, alcohol, and ether. They needed absolutely no traces of the wash water left on the glassware.? Each was soluble in the next, so you wound up with all of them evaporating off with no residue left. You can get away with just the distilled water and alcohol for our purposes. ;) Rinse with distilled water, then with high-proof alcohol. I use 91% Isopropyl alcohol for that purpose. It won't remove oil, but the acetone or whatever should have already done that before you rinsed it.? Then, again, oil the parts! :)

It should work as well for you as is possible then. If you leave too much oil on the chuck, don't be surprised to get a strip of oil spattered up your shirt, face, and glasses. You want a thin film so the parts slide well, without enough to fly off the chuck once it spins up.?

HTH!

Bill in OKC?