I see no reason you couldn't go with a larger size SS screw in the original holes. You could make up a little peanut butter the holes shut, or use similiar compound. Two suggestions for you, you can use a driver after pre drilling, but hand tighten the screws to final position. And two, make sure the teak is cut to accept the bore and countersink of the screw you plan to use. For cabinet work I use bits that are the bit, countersink, and stop in one, perfect every time.