Sounds like your 17 is a reproduction gun. I believe his new water jackets are made as exact copies of a 1917 and they will fit on the 28 tripod no problem, however the earlier ones will not fit the 28 pod. This in no way takes away from the excellent craftsmanship that went into that first batch of repro jackets.
If you are serious about buying a 1917 pod, now is the end of the best time in this century to get them. Once oow runs out, they will go up substantially in price and be difficult to find, just like the 28's did. It will not be a bad investment whether you use it or not.
If you are serious about buying a 1917 pod, now is the end of the best time in this century to get them. Once oow runs out, they will go up substantially in price and be difficult to find, just like the 28's did. It will not be a bad investment whether you use it or not.