<HTML>Hi, David - Replacing stage dolly wheels is very straight forward.  You can replace the wheel only, if the frame is OK.  Or you can replace the whole thing.  They're available from Jansen or any of the suppliers from whom you can purchase the dollies. I like to use a hydraulic jack for these stage dolly jobs.  Mine is a common half-ton bottle jack mounted on an adjustable stand modified from an automotive axle stand.  Simpler: you can set your jack on a sturdy piano bench or chair.  Place two small 2x4 blocks under two of the limbs of the dolly then jack the piano near the other limb to take the weight off the wheel you'll work on.  This method is very quick, easy, and safe.  Works for various leg repairs and dolly installation jobs. Another technique I've used with success for changing a wheel:  Use a small screw jack (Starrett machinists' jack) directly under the limb of the dolly you'll work on.  In this case, no need to block under the other limbs.  You'll only need to raise it  a half inch or so.             -     Tom McNeil     - Vermont Piano Restorations "Outside of a dog, a book is a man's best friend.  Inside a dog it's too dark to read."   -   Groucho Marx</HTML>