I have an approx. 30x30 cabin door hatch that is made if 1/2" teak (not plywood). It simply slips up under a rim and into a recessed area, then padlocks at the bottom. Problem is the teak is warped bad enough that the "board" won't go up into the slot and into the recess without a lot of force. Wondering if there is a do-it-yourself way to flatten this out again? Thanks!