hello all. could anyone tell me what the drop below the pivot point on a jig should be to enable the shell to turn 360 degrees easily. on all pics it looks around 6 / 7 inches to the bumper brackets. has anyone got one they could possibly measure for me. i need to get 2 built so with cost of buying it is expensive and i have all the steel available already so will save me around £500. also will front and back be the same. i would imagine it would be. couple of pics of how adjustable ones work would be ok aswell. due to height in workshop i need shells to turn as close to ground as possible so would probably have to reweld a jig if i bought one anyway. thanks.