Here's what I came up with. 17-3/4", a 1/4" screw stud in one end, wing nut shake proof washer to the bar. tab/ear that turns up or down on the end. Can cut wood, dowel rod, 3/4 X 3/4" or a stick to what ever length needed. Can cut up to 12" rounds with out removing it (20" bar) Big rounds, mark log with the saw, then remove. Quick on & off. Maybe an earth magnet & stud to mount to the bar for even quicker on/off. Old piece of a fishing pole, fiberglass, carbon fiber with stud glued in the end would be even lighter. Plastic, synthetic or nylon bolt so it it falls out & you hit it with the chain, no damage to the chain. Will it work? Patent pending?