that trade in thing is a joke....for 90 or 100 dollars they'll trade one in.....OR you can spend another 5 to 10 dollars and get a brand new one.....HMMMMM sounds like a NO BRAINER to me....I saw a guy an e-bay that refinishes them w/ used parts, he pinches the sleeve, refinishes the piston somehow and garantees them and only charges 30 bucks..says you have your mill back in 5 days.... if you're looking for a cheap quick fix that sounds like the way to go to me.....I forgot the search I used but it shouldn't be hard to find...I just saw it last week....