It sounds very promising to be in contact with an ex-PanAm machinist!tpetsch wrote: ↑2022-11-08 19:03So something like this?, interesting. Instantly makes me wonder if a one piece step type washer like this may be an improvement, the ex-PanAm machinist in me looks to improve upon the metal washer stacking, or do you use nylon washers?lejonklou wrote: ↑2022-11-08 01:04Below my big cases, they need a big washer that supports the entire top surface of the foot and a small washer that makes a contact surface area against the case of 1.3 mm2. The rubber foot alone doesn't sound nearly as good.Tendaberry wrote: ↑2022-11-07 15:43 Just wish I could get hold of the same rubber feet Fredrik is using under his amps…
I have tried one piece variants (similar but not identical to your image), but two washers was always better. They should have their flatter sides against one another (which likely makes the contact area against the case smaller in practice than 1.3 mm2). An interesting detail is that the smaller washer needs to be 1 mm thick. The original one I tried was 1.2 mm. Then I found the 1 mm one, which was clearly better, but all of a sudden it went out of production. It was replaced by a 0.5 mm thick one, which I tested and it really sounded a lot worse (silly, I know!) I couldn't find any similar washer anywhere, so I contacted the factory in Germany that made it and asked them to make the 1 mm version for me. To my delight they agreed to do so! That carton I now have are the most expensive washers I ever bought.
I don't rule out that there could be a one piece solution that is even better. One probably needs to make and evaluate a LOT of versions, though.