BBC Master keyboard

Many thanks for the helpful comments from Pete, Tony and Adrian. Lucky for me I discovered that the terminal pins unscrew. ALL of the keyswitch terminal pins have be cleaned with a mild abrasive (Brasso) and then washed in IPA. I had to remove all of the switches to clean the rust from the frame, but what the hell, they're back to original condition. BTW I don't have any WD40 and would never ever use it on any electrical or mechanical parts - never ever ! Also, as the leaf springs in the key switches are gold plated I've left them 'as is' and not used any propriety "switch cleaners". They should work for another 15 years :-) Also, fixed the intermittent dry joint in the PSU and added the composite video colour mod. Found the last one on the Acorn FTP site http://acorn.riscos.com/documents/appnotes/ This was one of my better buys from Ebay. My only complaint is the tatty case - I will have to think about "re-boxing" it. Perhaps in a 1U 19in case, it will make the connectors a little more accessible and support the weight of the Cumana dual disk drives ! Thanks for the help Chris Chris