I've got a 336 RC .35 Rem made in 1957 (I think). It is a bit of an ugly duckling but I'm slowly working it back into shape. None of the available hammer extensions will fit. I don't really like them but I have a very low mounted scope and am a bit nervous the thumb will slip off the hammer. I may make a clamp on extension as a last resort but as I said, they are not my cup of tea. I'm curios if anyone knows if a later model hammer would fit this action? If so I wouldn't be afraid to modify the spare hammer to my liking. I'm thinking of TIG-ing on some additional material rather than a clamp on piece.