Hall of Fame
Figured it out. After removing one side of the stand/legs, I was able to fully visualize the locking pin and the spring.
It looks like when the pin is in the non-locking position or down position, the knob/lever and pin is supposed to hold the spring down, under compression. In other words, the spring should always be pushing the pin up. My spring had coiled up the pin and around the knob/lever enough so that it was no longer under compression and therefore unable to push the pin up.
Simple Fix: Simply unscrew the knob/lever from the pin, push the spring down below the level of where the knob/lever screws into the locking pin, screw knob/lever back into the pin, keeping the spring compressed below the knob/lever.
<a href=" https://i.imgur.com/vVMIYhX.jpg" title="source: imgur.com" /></a>
Hope this helps others. I do wonder how long it will take for the spring to coil itself back up past the level of the Knob/Lever...
Thanks for posting all this !! It inspired me to fix my ML-100. I had an issue where the lock wouldn't function. Though
i had a different problem your journey helped me to figure it out.
Mine had to do with the Center pivot that the turn table goes into.
The two big nuts on the side allow u to center that part. Mine came out of Alignment which prevented the pin from engaging into the
holes correctly. It been like that since shortly after i got it. I just ignored it till u posted in this thread.
Its nice since I now string up some O port prince racquets.