I have an old worn out Maillard 7 speed freewheel on a 89/87 era Athena hub. I happened to check on the status of an order I had placed with a shop for a 7 Speed Sun Race 13-24 replacement freewheel, when they mentioned having a NOS Synchro 90 7 speed FW in stock. So I bought the thing, and threading issues aside, will this give me any other grief? It certainly weighs a ton, but I'm used to cassettes...