Here is the one that a couple of us did a few years back on our ck35's imagine it would be the same for your 3510.
My Pictures start on post 21 did all hard lines on mine!
https://www.tractorbynet.com/forums...35-3rd-function.html?highlight=sinatra+method
Did you use the valve listed in the "sinatra method" or something else?
How's that function?
For some resin I am getting stuck on the valve type. I think I've found a few options looking at other kits that are out there, and can be into a valve and base for under $200.
But when you start swing kits for $450 (bailey) or hopefully a kioti with hoses for $650....