I have a better idea...here is one of my old adjusters. Some of them were lucky enough to not have hardly any visible wear on them. They are not the interferance type adjusters like you have, but rather you can finger screw them into the rocker but they have a locking nut on them so you can tighten them down onto the top of the rocker. The top of the adjuster accepts an allen wrench so you can hold it in place while you lock down the nut. If you want to try this just give me your address and I will send you one...no charge. Just glad to be able to help out.