Richard, I have the same boat as yours, but as
always it is there and I am here.If you remove both mounting screws (be sure to keep the screw seperate so you know which came out of which hole) you should be able to look down into the hole and see the threaded devise or plate that the screws mount in. Then;1. Check each screw to see if the threads are intact, ruined, stripped or rubbed out. If the screw is wrecked then there is a good chance the holding plate is still good. Usually in this type of installation the holding plate is harder than the screw so the screw fails rather than the plate.2. Using a thin sharp scribe or ice pick, check if the mounting devise or plate moves around. Has it broken free of the fiberglass that locks it in place? If it has then the easiest repair might be to drill thru and mount and seal a new plate inside the boat.3. Is there a mounting plate or nut there in the first place?4. If there a plate is it steel (magnetic), stainless steel(very hard) or aluminum(soft metal).If there is a plate or devise and it still is tight then;1. Steel. Go to the next size screw, drill for this tap size, use bottoming tap to install new threads, blow out carefully and install this size screw with some type of sealent. Remember to drill fitting for new screw size.2. Aluminum. Same as for steel or heli-coil to use same size screw. My choice would be to heli-coil both.3. Stainless steel. It is not very forgiving and hard to work for some one not used to this work. Yor might be better off to drill clear thru until a backing plate can be installed from below and sealed. Not much help, just a lot of work. That is why we have winters. Project time.RayS/V Speedy