Great stuff, Bob. Very helpful. Yes, just to confirm, when screws are buried under epoxy etc in a boat like this and will never be removed square drive is much easier to work with. Boatbuilders habits with slotted screws stem from those being necessary on boats and in places where the screws may later need to be removed, especially in the backbones and planking of traditionally built boats. The slots allow the person to clean out the groove and get a good grip with the bit to remove it no matter what kind of gunk the groove is full of. Very hard to clean out a square drive screw to get a bit in once it’s filled with goop. Steve