I'm one of those who has never built a window but this sounds like something for "Ask This Old House" maybe Tommy or someone would come pay you a visit and we could all watch on TV.
Now having said that I do recall seeing a show where they they took the stops off and installed a new "track" and new windows..... Might have been Hometime?????
BTW:
www.thisoldhouse.com/toh/tvprograms/asktoh
Ed
Now having said that I do recall seeing a show where they they took the stops off and installed a new "track" and new windows..... Might have been Hometime?????
BTW:
www.thisoldhouse.com/toh/tvprograms/asktoh
Ed