Well, now that's an interesting question. While I use the Scott's dampener, I make my own pin support. I use a 1/2 inch grade 5 bolt (cut the threads off and just use the bar stock) and center drill it with a 5/16 drill. You really need a drill press to center drill, and I made a little jig out of a section of 1 inch angle iron with a small piece of 1/2x1 welded on the side that I can clamp in the milling vise. It's tough to visualize, but the 1/2 bolt section is clamped into the angle iron with vice grips and then the angle iron is clamped in the vice with the little tab that is welded on the edge. This jig holds the 1/2 bolt section in a straight line with the drill bit, so I get a straight hole.
With that all said, if you do not have access to a drill press, visit your local machine shop and have them bore a hole for a few bucks. It should take them just a few minutes, so should be cheap. Either way, you get your pin holder. The length and hole deptgh will have to be determined after you install your higher towers, but is not critical.
Once your pin holder is complete, purchase a grade 8 - 5/16 (or comporable metric) bolt with a good section that is unthreaded. This will become your pin. Cut off the head and threads, and carefully flatten the bolt on each side with a grinder so it fits in the arm of the dampener. Your pin should not be more than 2 inches long at most, and better to be a little shorter. Also, you will have to weld on your custom pin holder, but is a snap with either a wire feed or a stick welder (tougher with a stick, so the guy welding has to be good).
As a final note, I used to weld on gussets at the bottom of the pin holder, but found that they are not really required, and ahve never had a pin holder bend.
If I have been too confusing, let me know and I'll try again.
Rick