This section deals with spring mounting various parts of the boat.

I spring mounted the periscopes first, but then had the bright idea to just spring mount the entire conning tower. This lets me keep a nice tension on the forward cable going to the net cutter. The rear cables are also spring mounted and have little hooks on their ends. So they hook to the conning tower railings and always maintain their tensions, but are easily removeable when you separate the boat for transport.

 

 

First I make some very strong attachments to the bottom of the periscopes. I put about 1/4 inch of resin inside them, having first packed foam inside since I saw no point in completely filling them with resin. I soldered a brass loop onto a brass screw.
I pre drilled a hole and threaded the loop in. It's very strong, and it has to be to hold the conning tower onto the boat.
This is not my final setup, but maybe you would prefer this. I finally used considerably stronger springs, but if all you want is flexible periscopes and not full spring mounting of the entire conning tower, these are perfect.

I didn't do enough photography on this, but I'll try to explain. Each spring hooks onto a brass rod which is parallel to the centerline of the boat. Two thicker brass strips are on each end of this rod and they used to hook underneath the deck - until they pulled it up! So I drilled two holes in the bulkhead just below deck level and inserted two 1/4" brass tubes (painted black) to take the stress. Installation procedure is this: port rod is inserted, the brass rack is slid underneath it and pushed to port until its starboard side can be pushed down, at which point the starboard rod is inserted and the rack slid back to center. The railings make it a pain, but I'm very happy with it overall.

I mounted a little brass rod under the deck and hooked a couple springs up, one to each antenna.
This lets me hook the cables onto the conning tower railing and then move the conning tower back to tighten the front cable. Everything is always tight, but separating the boat is still not a problem.