I finally decided to make a stop for my 3 pt on 3515ch. Now, it is a bit rough as the only tools I had were hacksaw, file and drill. I used 1/8" x 1-1/2" aluminum bar stock. I stacked the base pieces together and created a moveable stop piece. The base pieces are ~ 6-1/2" long. I have used to while mowing the pasture and has worked well so far.
