 Russell..... ...here is a picture of an ORC (over running coupler). They come in 4-different PTO size and sexx combinations so you don't haffta use extra adapters. The N-Tractor PTO originally came as a 1-1/8" 6-spline. In the mid-50's the ASAE changed PTO specifications to 1-3/8" 6-spline. So having a "built-in size-change" is advantageous. How do you know which PTO size you have on yer tractor, measure it, simple eh? It ain't a micrometer kinda thing. ALL modern brushhogs are 1-3/8" female 6-spline sliding PTO shaft. You will haffta sacrifice several hacksaw blades to the PTO gods and cut BOTH sliding ends about 3"-SHORTER. Don't worry, PTO shafts are made to be cut, but they're tuff'n'hell steel. Cuttin' torch leaves a too-ruff end-cut, so you really haffta dress-it with grinder. Install with 5/16x2" rollpin thru the removable grease zerks. The ORC prevents all that rotary inertial energy from back-driving thru yer PTO shaft into yer tranny and out the diffy where yer engine clutch and BRAKES DON'T WORK. And will drive yer tractor into the corner of the barn, fencepost, powerpole, creekbank, irrigation ditch, wife's car (don't ask). $60 (cheap)..... ..Dell the ORC safety preacher
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