Doing a few odd jobs in the gun room this afternoon. Too hot to shoot. Based on sage advice from a well know SC air gun guru and general good guy (thanks Gene) I modified the spring compressor. A 12" piece of allthread now goes through a 1" coupling bolt countersunk and epoxied into a 3 x 3 in block of wood. This block is u-bolted to the baseboard. A 1/2 in hole is drilled through a 2x4 block and backed with two locking nuts and a large washer so that the metal end of the allthread does not pass through the block. The block is a treated pine "skid", ie, scrap lumber from the local Lowe's and is slotted. I have oriented the slot vertically and allow the pusher block with a small felt pad to ride in the slot to make slight vertical adjustments. Much more solid than the previous arangement. Can get about 8 in of travel out of the all thread if needed. New, correctly sized Maccari seal will probably arrive Monday. Then time to try to get the lubes right and re-assemble.