the legs for my flavel finesse 100 duel fuel cooker wont stay under the co?

Cooker legs usually screw into the cooker from below - into robust threaded holes - they're adjustable for levelling the cooker. They may well pass through a crap metal plate but they'll go into a strongly mounted hole.

It's a puzzle how they became detached in the first place - somebody has been screwing around (anticlockwise) with your cooker legs.

Very creative the 28 mm worktop - but it will present a tacky image to visitors.

Good Luck...
July 2016