Respond to question# 06. Jean Michell intended and purposely designed the table plinth with the three threaded legs for final leveling it would be nice to have all the legs snugged but designed to compensate for leveling. As a tweak tip you might also want to consider Teflon plumbers tape wrap around the male threads of three leg shafts before threading into the female opening to help decouple table noise. When leveling place a spirit bubble level on the platter to were the stylus tip hits vinyl grove, which is about half way through vinyl arc and do final adjustment as mentioned with the threaded legs only. Do not use the spring knobs to level. the spring knobs are used only for the suspension adjustment, which accordingly to instruction should be 1-2mm gap between the bottom of the plinth and the felt washer under load. That means a Heavy vinyl placed on the platter and then clamped with arm in position about half way through vinyl arc similar to VTF setup.
Hope this helps clarify question# 06.
Hope this helps clarify question# 06.