MANY THANKS!! It works great and has saved me ££s on a new trackpad - they're overpriced here but invaluable for photo work. The hairdryer is a good tip but mine wasn't glued too badly. Also a pointed blade can get under the plastic grid and poke at the wiring on first starting to prise so care needs to be taken - a gradual short insert, twist the blade gently to slowly raise the plastic from the glue then in a bit further; work from both top corners towards the chip at the centre. I took extra care then, gently raising from both sides a little at a time. That said it still only takes 10mins. I drilled a 3mm hole (handholding the drill - the plastic is very thin) from the inside face of the plastic to keep the inside hole edge tidy (you can see where the centre needs to be if you hold the plastic plate up to the light). I found I needed to fine tune the adjustment after I replaced the plate so the hole is an excellent tip. Thanks to all who sorted this problem for me.