I never had to purchase any new pivot shafts either.
But here's a situation that i think you might be having.
More than likely those new shafts of yours are machined off shore, in China.
Then i'll bet they are threaded in a metric size.
You stated your using the original nut, which is fine thread American standard.
Then your trying to put together American, and Metric, which ain't gonna go.
Just my 2 cents on your problem.
