can anyone help a ham fisted individual? I have just been out testing my 300mm l series f4 and noticed some spots on the sensor. Cleaned those but then noticed a hell of a lot of dust and specs on the focus grid board. Following an on line guide i took it out to clean now it's worse than ever. Scratched to hell and focus points no longer illuminate properly. I.ve installed it exactly how it came out! I know it'll need a new one. Think should have left it to the experts. Any one know where i can buy a new fsb grid board & repairer near wolverhampton west mids thanks in advance. Simon
