RZucker
Senior Member
Could be.... the brits arange their springs based on the BSS thread... but the tricky part is they measure them when the half load is applied to the spring in compression so you need a special test/measure fixture that was only available from the New Hudson company until Lucas bought the rights back in the 40's and moved production of the test stands to Birmingham... even then you'll have a jolly time getting them to ship one across the pond!
That there is the issue... They are testing tension springs under compression. But if you stretch them first, I guess I makes sense somewhere. Probably explains the scarcity of those special test stands.