I need to make another 1 as the original got left sitting on the trailer mudguard and ran over, I'll get onto that tomorrow and take a photo.
If you imagine a sturdy bucket cut in half lengthways and then a ruler stuck to what was the inside wall of the bucket with the bottom of bucket now the headboard or measuring device. I then trimmed the ruler and bucket to the 30cm mark so that it's very easy to see if the v of fishes tail is overhanging
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