nakamichi RX-202 needs help

[adason]

hi all, I need help to fix my nak rx-202
it suffered broken pot which monitors the position of the tape during the flip
I replaced the pot, with as close type as I could, original is 10k linear, i got 10k linear, just slightly different maker (see the first pic)
should work, right? but the problem is, I can not seem to be able to adjust starting, middle and ending position of the tape, so it lands well and can be played
the tape does not finish the whole cycle, no matter how much I try to adjust those three trimmers (see second pic)

can anyone help me with instructions, or service manual how to adjust these trimmers? help would be much appreciated, since I love this deck and it served me well for many years, and this pot is the only think which got broken
sound was still great before it happened

thanks
ed