Originally Posted by Ex-Calif
We made a circle of plasticene/play-doh and laid it on a thin 1/4 inch ply. We slapped it on the outside and sunk wood screws through it. Pumped the water
At sea you would have a hard time drilling the screws in but sea pressure might help hold the plywood
until you could get it affixed. A manual hand drill (works underwater) like grandpa had is a great toolkit item.
club wanted to replace the echo sounder transducer on an 80 foot steel
RN fleet tender
weighing about 140 tonnes. Couldn't afford a lift
and didn't fancy beaching her, it stumped us for a while.
Then one bright spark had the idea of putting the new transducer in a bucket. Applying radiator pipe insulation
around the lip of the bucket and tie it in place under water
. Undo and allow the old transducer to drop into the bucket and through the hole fish
the new transducer into place. With lots of divers on standby it worked like a dream and job was completed in 10 minutes leaving everyone wondering what was all the fuss about.