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Welding plastic bags
Just finished mine. About to test it with a free-diving crowd in Simon's Town, South Africa. Thanks for the Instructable!
Automatic bicycle pump
Diving Depth Gauge
I just tried the pencil gun & 2 sticks method on thick black polythene - the kind you use to line building foundations. It worked great. The sticks I used had chamfered edges so formed a small "V" and I used a roller (the kind you use for gluing veneer or drywall taping) to press the edges together. I formed a sleeve that held water without leeks first time out!
Thanks for the great instructable!
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