Thats brilliant thanks for the offers
The donor watch is a 'Kenneth Cole' which is being shipped to me in the UK from the USA so it will be a couple of weeks before it arrives.
I have some reed switches of the correct spec' and some 3mm blue acrylic sheet, to make the crystal out of, on it's way so together with the two donor Pulsars picked up from the recent eBay auctions (Pulsar Tom's old stock) I think I have just about all I need.
I think I will probably start with the crystal as the acrylic should arrive before the donor watch.
Cheers Mick.