I know this is old post now, but I bought a rubber kit for mine at Marco. I also bought a buncha white barrel caps to replace the metal acorns. I think it makes the machine look brighter and cleaner and I never liked the feel of those caps tightening and loosening and you won’t need something to hold the post if the metal cap gets stuck. They’ll probably dry up and need to be replaced eventually but should be fine for many years. I kept the originals all in a bag for the diehards that want original parts if I ever sell it (not!). I also needed to replace a few screw posts in the process so good to order some of those too. If you’re ordering parts get yourself a new shooter rod spring too... highest tension (“red” one).