I went with the Briggs they offered for the 500 IIRC, not because it was a Briggs or Kohler but because that's all they offered at the time. I've had equally bad luck with modern Kohlers as with modern Briggs. The Briggs is a commercial unit and I sure hope it does better than their consumer line for $2200.00! Of course half that price is SEW's crank and fittings, R+D, etc.
The VSP should be in 2 pieces. The moving pulley does not, or at least should not, ever be able to cause the fixed pulley to move. I think probably you have an alignment issue. Check the other pulley, the driven pulley under the seat and make sure it's opening and closing. If it's stuck or hasn't been greased and you use the variable speed selector you're altering the alignment. The other thing is the fixed half of the VSP moving by itself. If the set screws aren't holding then you need to investigate why. Mine has either 2 or 3 set screws- 1 on the key way and another that butts up against the brass inner sleeve. I have no idea if that is factory or not. It's not a big deal to add additional set screws and if you go through the inner sleeve you gain a lot of thread area. If the fixed half has any play when the screws are tightened down then yes, the screws at the end of the crank will help. Check and see if your set screws are stripped at all too. And check your alignment
again too. If the belt is running cockeyed you will have problems. I spent several hours figuring alignment out and still am not sure I have it 100%. Opposite halves of the pulleys move when you apply the VSP- the left half on the VSP and right half on the driven pulley. Makes it fun getting it right. You also want to check your crank for play and that inner sleeve for wear. Mine is belled out pretty good and needs replacing to work right without the set screws.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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