Hey Rob!
Searched for fixes for your worn wheel cyls. Two replies came back.
1) hone them over and have them plated and re honed. 2) sleeve them in brass.2 sounds easy to do. It was suggested that the sleeves are retained with green locktite. then all the ports are re-drilled and carefully de-burred.
Cyls are trash now so you might as well try!
Cheers!
Sean