Gerry,
I have just finished a tilt cylinder mod on my new Daedong EX50, we live on a hill and it is a real pain in the *** readjusting the angle of grader blade etc.
A manually adjusted link will give a greater adjustment range over hydraulic because of the dead area in a hyd cylinder. I spent a lot of time working out the required length and stroke needed to give the amount of angle change needed for what I want the tractor to do. (Dont forget the pivot point is the end of opposite 3PL lower end)
I used a factory link, cut the ends off and re welded the ends back on the good thing about this is it has three different holes in the lower end, so I can change position easily at any time I want more up or down travel.
It is hooked up to the rear remote and at a push of the lever it moves ! I works great !
Maybe the people who are not happy with thier hyd tilt got an off the shelf one fit all cylinder that may not work well in the range they require .
check out the photo - just needs paint now !
Cheers
xcat