For all of your questions, not knowing where you live, I suggest you call
APT Instrument Specialists in Minneapolis, Minnesota (USA). Their number is
(612) 881-7095. Talk to Chuck Kulbeth.
These folks are very well equipped to deal with most instrument issues. Very
knowledable and very reasonably priced. Their list of accomplisments is too
long to list, but suffice it to say that I'm a very satisfied customer of
theirs.
If you are not in North America, then I can only suggest
Speedograph-Richfield. Their offices used to be in London, but I've lost
track of them. I believe they have moved out of the London area. Maybe
someone else can help here.
Regards,
Lew Palmer
lew.palmer@uci.com
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