New Holland 273

I have a old 273 hayliner that isn’t tying like it should. I was wondering if they make a knotter rebuild kit or what parts I need to rebuild mine. My right side keeps missing knots then it may bale 30 without an issue. I’m also have some problems with bale length. Some bales will come out 6-8 inches longer than the rest. Any help is greatly appreciated.

New Holland 273