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you could use that pesky handle to lock your ply in place...
mikee.....with all the studies that boffins have done over the years you would think by now they would just about be able to talk to them...

you know that youngun isnt silly at all.........there is no reason they couldnt be sonically told to bugger off from some areas....you could have half a harbour that is unpleasant to thier senses and...

Ive seen photos of a sit on kayak done with strip lighting in the grooves...light shone down nicely...also old school spotlight bulbs in test tube with tight fitting bung to seal them off.
sure...