Emerson-Greenlee Pole Saw Dog
Emerson-Greenlee Fairmont adjustment dog for 38568, 43177, and 43178 long reach chain saws with serial numbers that start with FR. The digital micrometer measurement of the dog from side to side is .395. The adjusting screw threads into this part and the tab fits into the bar to adjust the chain tension.
Part# 21 in chainsaw parts manual FR series
Cat # 105378
UPC # 40197
Part # 50401972