The washer was molded into the rubber improperly in one of the tips so that within 4 hours of use one fo the tips failed with the metal crutch poking through the rubber. Vitality Medical sent me another pair without hesitation.

Unfortunately I did not understand that I was NOT actually ordering "RubberMaid" crutch tip. I just finished going through 6 pairs of Carex Crutch tip. They last 10 - 14 days and then the bottom breaks out and my crutch pokes through.
I have been on crutches for 38 years and have never used such an inferior quality tip. I use wooden crutches because after time the metal (aluminum) cruthes can wear out the plastic protector cap on the tip and the bare aluminum cut through the crutch tip.
As soon as my wife and I return from our July 4th trip I will be calling to arrange a return and a refund. I also have a worn set of Carex Tips with all the rubber intact and a hole right through the center.
Wherever you are having these made (I know China - but whichever factory) you should change suppliers or instruct them on how to produce high qulity, durable rubber. If this means I will pay more for my crutch tips I will be more than happy to do so. Can you imagine buying a pair of shoes, and after 2 weeks the soles are worn down to your feet?
Mad Mad