Downrigger cable stopper

Could anybody tell me by what means electric Scotty or Cannon downriggers work when they stop to retrieve the cannon ball?
I’m asking because I have an old Walker downrigger for which no parts or support is available anymore. On these, there are three tubular magnets attached to the cable near the end. When the magnets come to close contact to the sensor, located on the body of the downrigger, it triggers the stop.
A couple years ago I lost the ball because the cable, despite being made of stainless steel, was rusted out in the spot where magnets and the clamp which holds the magnets on the cable are located.
I replaced the magnet taken from another Walker downrigger and it worked fine for two years.
Now, inspecting the downrigger and cable I noticed that the shrink tube which covers the magnets and clamps is partially ripped off. I took it out and found out that two out of three magnets are completely rusted out.
I had checked everything online (Ebay, Amazon etc) but was not able to find anything even close to those magnets. They are quite small, about 3 mm OD.
How does it work on Scotty and Cannon? Similar principle? Maybe I can get those magnets from them?
Thanks!

MarkD,

I am hoping for some follow up on this to confirm....

Scotty riggers have plastic tabs you place on the cable. When they run through the rigger they trip a switch.

In theory, you control when the unit shuts off. I preferred under the surface. I used 20 pound sharks later in the season.


I think Cannon senses the change in electrical signal as the weight crosses the surface.
Their latest models might have ways to set this on the keypads.

I'm not a Rigger guru but have used enough. For manuals, the Cannon are the top of the line. Electric Scottys are pretty fool proof..... but I'd love to get my hands on the latest Cannon models however.

Sent from my SM-S901W using Tapatalk

So you mean that on Scotty there is a mechanical switch, simply put, the bids on the cable just turn off the circuit switch mechanically, correct? No additional sensors or electronics involved?

Quote:

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Originally Posted by MarkD

So you mean that on Scotty there is a mechanical switch, simply put, the bids on the cable just turn off the circuit switch mechanically, correct? No additional sensors or electronics involved?

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That is correct.

Thanks a lot!
Very helpful!