Picture shows some of the difference in most of them. See the connecting rod joints. Also the pivot uses ball bearings instead of the IH needle bearings. Also the pivot shaft has a nut with screwdriver slot at engine side of the housing to retain the shaft. None on IH. Some pivots used a different length from center to the spring hole for a different leverage compared to IH. Most include there own spring and a bushing to install in the forward spring hole. Most include a throttle shaft and tube to the carburetor. Most other than M&W are plain but you can spot a difference from the IH if compared. Depending on time frame M&W could be plain, have a tag with two rivets mounting the tag or have a flat place with G-11 power governor on it.
Picture not to plain but if you look close see the pins in the two weight unit have a long cotter pin through both weights. IH not retained like that. That's a M&W 2 weight. Thompson and other aftermarket brands also used the same.
M&W also used a 4 weight that pivoted on pins.
Rocket used 4 weights mounted by notches. Can't remember for sure but think Thomson and rocket were partly the same at one time. Some aftermarket kits were sold that didn't use all the parts mentioned above.
Happened to think some of the power governors use a different size bushing for the weight shaft than IH at the rear of the housing.
This post was edited by D Slater at 08:52:37 10/22/13.
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