In reply to:

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What would be the best method to do this?

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Hell, the best way would be to bring that Merkel down under and we'll soon sort that length of pull out!
Aint nothin like a serious field test to get the thang workin right!
Far better than tape measures and tryguns!
Couple a dozen hogs a few brumbies and a bull or two might be the go!
Yeah?