However, for those installing older Schrader stems onto rubber stem tubes, it is a problem.
Somehow, I came in possession of a couple of flat bridge washers with the smaller, Schrader 777 hole size. I really wanted to use them with my 777 stems, so I came up with a plan. I bought some 1/2 inch brass plated steel grommets and crazy glued one half of the grommet to the bottom of the bridge washer. This perfectly mimics the dimple on the bottom of original bridge washers. Once installed on the stem and tightened down, the grommet can't go anywhere, the crazy glue is just for holding the grommet in place during installation. I did have to do some sanding on the excess crazy glue to get a smooth surface.
What do you think? I think this would work on the flat bridge washers for the larger 725 size stems as well. You can get pure brass or brass plated steel grommets from dozens of suppliers on eBay and elsewhere. Here is a link to show one of the many sources for the grommets.

https://www.mytarp.com/products/brass-g ... gJNs_D_BwE