John Deere 337 Square Baler Missing Knots

Long time lurker here, first time poster. We have run my grandpa's 337 for three seasons now without too much trouble. Late last fall in Oat straw it started missing but we were baling in the snow and unfavourable conditions so we weren't too worried about it. This year in grass hay we are missing between 2 to 50% of our knots, almost all the left side not tying.

I have lifted and inspected both knotters, the right knotter has the roller for the knife arm seized with flat spots worn on it so I have ordered a new knife arm as it is the older style without the snap ring to replace the roller. Nothing else seemed out of place except for the knives being dull so I sharpened them as best I could.

Today I rode on the baler a bit and occasionally it seems the knot gets stuck in the knotters, stuck below the twine disc where the spring thats against the bill hook is. The other thing we've noticed is it quite often will break two successive bales, and it has twice dropped two bales tied together that we've had to cut apart.

I have attached pictures of a few different missed knots today. The first three pictures are the same knot where it appears the short length has not completed the tie but the long twine has. The fourth picture is a successful knot bit doesn't look cut properly. Pictures 5 and 6 are also a successful knot but some of the tail appears folded over back towards the knot which seems incorrect.

I have searched some older forum posts and it appears the tucker fingers have come up several times as causing these types of issues.

Any guidance or suggestions for solving this will be appreciated as we have around 1000 squares worth of hay sitting on the ground and rain forecast for the weekend!

John Deere 337 Square Baler Missing Knots