TheSkySearchers

My iOptron AZMP tripod legs have metal caps which removable metal spikes.
Neither is good for a wooden deck or concrete floor. I was using vibration pucks, but they have tendency to slide out.

The other day I was looking for something in the garage and stumbled on a tube of racquetballs.
Bingo! Cut them a bit off center - perfect fit! They are made of tough thick rubber, so should last for awhile.

What a great discovery. This is an excellent use of an object intended for something completely different. Although, one could claim that observational astronomy for amateurs is a sports. At least at my age, observing and the physical demands it makes, feels like a sport.