Used a bit of 2" Velcro with a couple of scraps to hold it in place..works well..cost?.............nuthin!
Thought of clingfilm, but have yet to try it due to the success of the Velcro!
Bored, cos the roads are salted, and though I dont mind gettin it wet(!), I think salt might be better on my chips,so I aint going out,hence sitting here thinking of useful ideas to impress and amaze..........