Before you commit any money it would be worth contacting a few spring manufacturers to get a handle on costs of making copies, I've no idea how many sets you could sell as lots of people express interest until it comes to fronting the money, whereupon they suddenly lose interest.
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It never got fast enough for me
Hunter S Thompson
R.I.P. Peter David Scott 18.07.59 to 21.11.16
Will be missed by us all but we will always remember you.
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