[DanRudolph]

Sailingdog, thanks for the tips. The jackstands are currently on crushed stones and they are not chained together so I will talk to the marina and see if my boat can be moved to macadam and have chains added.

Camaraderie, I’ll interpret your questions as to why one would consider doing this? as why would one consider doing this on jackstands?

Because that is where the boat is and I need to step the mast to replace the main halyard sheave. I also have to make other repairs to a through hull before the boat goes back in the water, so on the jackstands is where the work will be done. Your other comments, not helpful, not cleaver.