Removing bungs
I had to remove my companionway hatch a few weeks ago and I removed the teak bungs with a small rotary hand drill. In his book entitled Boat Carpentry, Hervey Garret Smith mentions this tip for removing bungs; take a small wood screw and cut the head off it and insert the screw into a rotary drill brace. Drill into the center of the bung,and it will back right out when the the screw hits the head of the screw beneath the bung. Like the other fellow said, you only need to remove one moulding to get the sliding hatch out. When you get it all back together,to install the bungs, just coat the bottom and sides of the bungs with a little varnish, and insert them so that the wood grain is going in the same direction as the grain of the moulding, and carefully tap them in. When they're dry, take a sharp chisel and cut a little off each one until they are just high enough to sand flush, with sandpaper. That's it. Good Luck!