273 adjustable rocker conundrum..

4spdragtop said

But will they thread onto the factory adjuster screw?
Where is the "interference"? Is it the threads on the screws, OR the rockers?

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The interference is in the rockers. You can pull them off the shaft and wrap them with a hammer to tighten the adjuster screw. And yes, the threads can be worn through 50 years of adjusting but the adjuster threads are softer than the rocker threads.