I have two speed screws if anyone would like a good buy on one. I was told that the second one I ordered would go the full hight of the IR50/50 target, but it won't when in the Hart base.
I suppose I could cut a bit off the rear leg of the rest; then it would work fine, but I just use the wheel to go between rows and use the Hart rear screw for fine elevation. It works very well and has good range of motion.
Picher