The grinder I built is based on the EERF grinder plans (which is basically what the GIB is) Some of the changes I made were to make the main upright taller so the contact wheel arm is parallel to the tool arms. This improves tracking. Also, I combined the plates that form the left side of the two tool arm pockets into one large plate. This way, the tool arms are aligned vertically, as opposed to the offset configuration of the GIB. I also made accommodations for a variety of tension setups- spring, gas shock, and gas shock with cam over tension release. The last option is pretty awesome, as it allows you to change belts without having to hold the arm down against shock tension. The plans are hosted for free on my FB page, there is a post pinned to the top. You just need to give the plans to a water jet shop and have them cut it out of 1/2" plate. Also, all the holes that get tapped are sized for that, so you just need to clean them up, and tap away. (mostly on that tool arm pocket plate I mentioned earlier.) Good luck!
