Flipflop

Thank all of yall for the help! I went with rubber O ring. Putting everything together now and then I'll let you know how it runs

One of the other forums I belong to, a guy suggested that I didn't need it but I'm worried about the long-term effects of metal slamming against metal

Let me start by saying hello! I'm new to this forum and would love some advise and help, I'm a little lost in a project. I'm in the Navy and currently stationed in Norfolk, Va. I acquired a 1950's Craftsman scroll saw (301.20720) from an older friend of mine. He said his dad bought it new but since his passing he has never really used it. To say it was in rough shape is an understatement but i got to work anyways. After breaking it down, it really wasn't as bad as i thought. I repainted the base and arm and cleaned up all the non-painted parts but somewhere in the process and multiple under ways i seem to have lost a part. I downloaded the manual and the part i am missing is part number 9 (rubber bumper ring). This is what i need help on. Can i substitue it with something like an o ring or piece of rubber tubbing? I've looked it up and the part is no longer made. Any help would be appreciated.