You need to clean the Bakelite disc and tracers. Green Scotch Brite and alcohol. Others may suggest sandpaper and a different cleaner. That’s just what works best for me. I put just a TINY dab of superlube on the disc and advance mini-arm around to spread so to speak when done.

Make sure the mini-arm that spins around is adjusted properly...not to tight/loose. I would clean the contacts on that arm(I use a flex stone file). Don’t adjust that arm till the end and only if you have to. Can be a bit tricky.

In the middle is a switch that is hard to see/adjust but it can be done. 1st make sure switch stack screws are tight. If loose, adjust the one closest to the blade 1st. I always check proper operation of switch w/continuity tester to make sure working correctly. Such a tight spot it’s hard to see by eye...for me anyway. Make sure that gear and cog move freely.

Hopefully that’ll get you going.