Ah, that wedge is because of the goofy table setup. In the states we use long wood and in that UK shot they are running the short round into the screw vertically so that the wedge will align with the split. There is no reason, in fact it is inferior, to include a wedge anywhere near the screw on the bark buster design. I even wonder what happens when you try and put a 4" diameter round into that hycrack. Watch your fingers! That round could easily slap down clockwise into the table. You are correct that on my splitter the log is leaned into the steel bar to prevent rotation. The round slides along the bar as it is sucked into the screw. You'll also notice the bar has a bend at the end to protect the operator from feeding his crotch into the screw. That length of electrical conduit lashed to the ROPS is attached to the PTO lever to disengage the PTO. It works, it works fast, but you actually need to pull the conduit instead of the more natural push. I have used it when a short round has slipped off of the screw and begins to spin at PTO rpm. Oh, in operation the screw is turning much slower than PTO540, the screw runs at about 1/2 speed or 270RPM and the engine gurgles along at half of pto speed.