Suddenly, the knurled locking screw no longer tightens against the pole, so the table won't stay down. I tried a slightly longer bolt and that one reached far enough to lock the table. What happened? Did something change inside the piston support? I'll try disassembling soon to see if I can figure it out, but if anyone has a fix, I'm all ears! 
Thanks in advance, 
​Tom Farr