I have managed to source some clear plastic tubes, approx 2ins x 25ins with a plastic cap at each end. I am going to ask Wedger to fill them from his sausage machine and freeze them. I will then decant the 2ins x 25ins sausage into the pipe on the stern of the boat and, hopefully, hey presto. I will let you know how it works out and, if anybody else wants to try, let me know and I'll bring some down.