Stroke limiter works in vertical mode also. I'm going to make one more mod before I paint it. Notice I'm using the pipe and plywood trick. Something I learned here on FHC. I got tired of listening to the pivot pin rattling so I hooked a spring between it and the hold down pin on the tongue.
No slipping or vibration issues at all. It works really well. It has two springs on it, one to hold the trip lever in the home position and one on the collar to keep the push rod from slipping down. I'm going to add a link from the trip lever to the collar which will eliminate one spring and keep the set screw with wing nut on top.
Added the link today. This eliminated the springs and keeps the wing nut on top. The collar tended to rotate around before. I also was able to turn the wing nut back around since it can no longer catch on the front of the cylinder. I love the way this thing works. I was splitting some crotch pieces left by another cutter that were cut to various lengths. I was able to easily adjust the stroke to a suitable length . When finished splitting just loosen the wing nut set screw and let it retract to the fully retracted position. Redneck engineering at its finest. The rod is 7/16"diameter 20" long. I wrapped a piece of sandpaper around the cylinder to contour the bottom of the 1/2: cpvc fittings to match. Hose clamps are 4 1/2" (just barely long enough, should of gotten 5") Hose clamps are spaced 3 1/2" center to center (not critical could be longer if the rod was longer). Just need to add some paint now. Can't decide whether the paint it black to match the cylinder or red to match the beam.
I am working on something very similar for my rock venom 22 ton splitter right now. Like you, I don't want to weld anything to the machine itself, rather to make it a simple bolt on to existing available points. So far I have a slightly different solution fixed in my head and 75% assembled, luckily mine has robust log strippers bolted on in this area (it's a half beam Gimbal type splitter ). My max log length required is 19 inches and while this may only save 6" of travel (12" there and back) I still consider it plenty worth the effort. Mind you, I also have a Jansen FS 35 ton Kinetic (no longer available in the UK )which will split near any log and return to base in around 3 and a half seconds. I would have purchased the american Super split, but like starlink, I can't get it here. I will post Photos when I have it working. Thanks for your post and photo's, most useful.