I wanted to thank Bob Gollihur for his tips on replacing the rubber tip on the endpin of my Engelhardt ES-1.
I went to the local Ace hardware store and after spending about $12.00, I now have 4 sets of tips for my bass.
I had seen Bob's advice at his website. I bought a 4 pack of 1/2 in. hard vinyl tips #5015623 and a 4 pack of 5/8 in. rubber tips #51239.
I slipped the hard tip on first and then the larger rubber tip over the hard tip. It works like a charm!
http://www.gollihur.com/kkbass/faq-endpin-tip.html