Logitech is a crap face for not supplying any MX Revolution feet.. and within 2- days of purchase the feet on mine are worn out.. What would be the best route for me?.. i was thinking about making some custom feet.. but what material should i use.. everyone seems to enjoy teflon.. but i heard it wears down fast .. so should i use something like a semi-teflon material.. if so..where do i score some of this?