Deck fittings...
The bottom end of the struts are captured by a shoulder bolt that leaves some clearance when tightened so the strut ends can pivot as the mast is raised. The ends will move around a little when the bolts are snugged down.In the mast up position, the struts are in compression and don't easily move around. In fact they are designed to provide support to the mast, and you should not operate the boat without them.The struts are poperly adjusted when the mast base pin can be installed or removed without too much effort with the mast down. With the mast up and struts in compression, it is very hard to remove any of the strut mounting hardware -- either top or bottom, and this should not be tried.Fair winds,Tom