Where on earth can you find some good material to make replacement rubber feet? My new Model F has a single rubber foot missing, and I've been sort of dumbfounded as to where I can aquire something to replace it. I'm also keen on replacing the rubber on my Topres and Model M, since they slide around a little too much for comfort. The feet on the Model F are very effective, and so I'm keen on buying something like those... would an online retailer specializing in gaming maybe have some?