Originally Posted by JohnBuckner

Yes storage can be a problem, what happens most often is the contra piston has a habit of welding itself in position within the head expecially if high castor oil is used. Problem is once that happens it can be difficult to free it. Heat applied jcarefully helps but if the compression screw is left in the compressed position after running, the engine is stored that way and the piston seizes then what a problem. When you unscrew the compression screw it only just backs away from the contra piston with no good method left to mechanically move it.

Now if you backed off the compression screw after the last run and turned the engine over to let it move to the uncompressed position it will now be easy to free it months/years from now with a little of the yellow label liquid wrench an you just need to screw the screw in to free it.

John