Who did the magnetic transducer mount?

I remember the post but I can't find it through a search.  If you're using a magnet to mount your transducer - or anything else - I have questions.

I want to use a samarium cobalt alloy magnet for a different type of mount but I keep reading the rare earth magnets (any alloy) lose most of their rated holding power if they aren't touching the metallic contact.  Is this true?

Nevermind.  Found it.

Looks like you found what you were looking for.  FYI - I still use the magnetic mount on the T-13 that Trident 13 made.  It still works just fine.

I didn't find Trident 13's post, but I found one by Widgeonmangh where he built a magnetic transducer mount that was inspired by T13's.

(Thanks for letting me know who got his Trident)

I did one too.  I built in April of 2019....Still going strong. 

Thanks!  I have a couple of questions, if I may:

A. Have the magnets corroded?
B. Did you attach a magnet inside the hull or let it be held in place with the magnet on the outside of the hull?
 

I did one too.  I built in April of 2019....Still going strong.

Thanks!  I have a couple of questions, if I may:

A. Have the magnets corroded?
B. Did you attach a magnet inside the hull or let it be held in place with the magnet on the outside of the hull?
 

Happy to answer what I can.  I encased my magnets in plastic.  Based on research I expected them to corrode, so figured I'd seal them up so they couldn't get wet.  I have a fishing magnet that utilizes what looks to be the same style magnet and it's got some corrosion after a couple years use.  I know these magnets can be brittle too, so didn't want to accidentally break/chip one having them exposed either.  The plastic I used is PVC, so was able to sandwich two pieces together with standard PVC glue.  That's how I made the arm as well.

I made a matching magnet setup for the inside of the hull, so my outside magnets marry to the inside magnets.  I thought that would provide the strongest attraction, but I didn't test any other options, so not sure if that was the best choice.

I have found that the magnets do well on my Lifetime kayak, but are on the weak side for the thicker hull of my Old Town.  I've since moved to a track mount for the transducer.

For the build I used two disc type magnets on the outside and two on the inside.  If I were to do it again I would probably make the mount larger and use four magnets, but then the mount has a harder time conforming to contours of the plastic.  Will attach some pics if I can figure out how. 

https://photos.app.goo.gl/DgGfa3waCWZo3GxJ7

Thank you, and thanks for the photos.  They help.

I appreciate the time and effort you used answering my questions.