I've had a speedo reconditioned by Andrew Rackstraw in New Zealand. It looks excellent and I am told he is very good. The price was reasonable. But, I haven't used it yet so can't tell you how well it works, however, I feel confident it will be fine. I did have trouble contacting him but think it is worth your trouble to speak to him.
Andrew Rackstraw Instruments ltd. 2 Argyle Grove, Upper Hut. 5018 N.Z 0011 64 4 9703707 021 299 6788
Russ.