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<blockquote data-quote="dfrisk" data-source="post: 236785" data-attributes="member: 2071">I've found the rear driveshaft hole to the front coupler sleeve hole is what wears the most. I've had drive shafts that would easily accept 5/16&quot; bolts or pins, and a 3/8&quot; would start into the driveshaft hole.&nbsp; I tried to explain what I wanted for my #72 to Julian at MWSC last time I rebuilt my clutch.&nbsp; I wanted a longer coupler sleeve with TWO 1/4&quot; cross holes for spirol roll pins, doubling the surface area being hammered. Maybe even make it long enough for 3 or 4.&nbsp; &nbsp; I had a red die spring in my 72 for a while, till the catastrophic failure of the throw-out bearing. Then I went completely back to all stock parts.&nbsp; And I'm running 14+ HP in my 72, a &quot;small flywheel&quot; K321.&nbsp; The stronger pressure spring REALLY cuts throw-out bearing life.&nbsp; If your running a heavily modified pulling tractor with DON VOGT caliber HP you need a stronger clutch. If your pulling a lawn sprayer, or fertilizer spreader, or aerator a stock clutch is fine.&nbsp;&nbsp; MIKE - Glad you got your Cubbie running.&nbsp; I have some work to do to my 3 and I can't even get near them in my shop!&nbsp; I have ALL MY stuff plus SON's wood shop in my shop!</blockquote>

[QUOTE="dfrisk, post: 236785, member: 2071"] I've found the rear driveshaft hole to the front coupler sleeve hole is what wears the most. I've had drive shafts that would easily accept 5/16" bolts or pins, and a 3/8" would start into the driveshaft hole. I tried to explain what I wanted for my #72 to Julian at MWSC last time I rebuilt my clutch. I wanted a longer coupler sleeve with TWO 1/4" cross holes for spirol roll pins, doubling the surface area being hammered. Maybe even make it long enough for 3 or 4. I had a red die spring in my 72 for a while, till the catastrophic failure of the throw-out bearing. Then I went completely back to all stock parts. And I'm running 14+ HP in my 72, a "small flywheel" K321. The stronger pressure spring REALLY cuts throw-out bearing life. If your running a heavily modified pulling tractor with DON VOGT caliber HP you need a stronger clutch. If your pulling a lawn sprayer, or fertilizer spreader, or aerator a stock clutch is fine. MIKE - Glad you got your Cubbie running. I have some work to do to my 3 and I can't even get near them in my shop! I have ALL MY stuff plus SON's wood shop in my shop! [/QUOTE]

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