40 mm Bofors AA guns made in GB and US

[Richard Suggitt]

Hi Rob, many thanks for your reply.

Unfortunately... the springs in our equilibriator are already adjusted to the maximum possible, and still dont balance the weight of the barrel. Hence they need to be retempered or remade... but we of course need to know the spring rate to temper or construct them to. Any chance you could place a known weight onto a spring (held vertically) and measure the displacement ? We could work out the rate from that.

As is the way of things I cant offer much by way of returning the favour.... though if your gun has the Bofors Speed and Course Sight fitted (as does ours) then I can share with you our discoveries about how it is used...

Thanks and best regards
Richard