I built an attachment for my 3510 with BL-10 FEL.
I had a spare set of forks that came with an old used Clark 4000# that I bought.
I have picked up so much weight that the tractor was crab walking when I tried to turn!
I should have put more up angle in the bracket, at ground level the forks are level when tilt is all the way up.
They will point straight down if I tilt forward, perfect for dumping trash off of the forks.