Thanks for your input, That`s the kind of info I was looking for!
1. The balls jump a little off the rail if hit firm.
2. I found some facings on ebay that are 1/4 " but they say they are 75 durometer. exactly what does that mean? Is it the softness of the rubber? do you think they would work?
3.Do you know the difference between the orange colored rubber and the black neoprene rubber? Which is best in your opinion?
Thanks H.P.
then your rails are too low .... or your balls are too big

the 60 durometer neoprene is available on amazon and it is black. it is available in small sheets.
you need to trim it to fit I used a little mini belt sander from harbor freight.
you need to make sure you have the right profile cushion and they are mounted appropriately .....
if you want things to go well you are going to have to do some more research on this site....