I'm a novice hobby machinist and love the idea of using 5c collets for work holding, especially since most of my machining is on smaller aluminum parts. I have a 12x36 lathe (g4003g). I recently bought a unreviewed collet chuck on eBay but returned it as runout was at about .002, run out on my 3jaw is less than .001, my spindle runout is .0001 or less. My question is- should I reorder a collet chuck (but better quality) or can I get away with a using a 5c collet block in a 4 jaw chuck? I would love a collet closer but I don't think they're available for the g4003g and I don't think I can machine one having never used one before. Any advise is much appreciated.