My wall mounted BV4-50 "cracks" quite frequently. I would also agree the cause to be expansion/contraction of cabinet.

Tom: beocool: A second win in 3 months! You're a lucky man, Steve77. Congrats! Life is not fair! Can't quite believe it myself. I will be having a flutter on the lottery this week that's for sure. Congrats to the other prize winners & best of luck to everyone else for the next prize draw.

I've had a pair for a while now. Solid aluminium. £190 a pair I seem to remember!

Can't disagree with you too much there Puncher, I'm not a prolific poster as you can see. I have posted in the past however but for some reason my "post counter" seems to have reset to zero??? Please carry on spouting incessantly.

Am currently away on holiday & have just checked my emails. Can't quite believe I've won something let alone an Overture!