A Blog for Fishermen
Sep17 2012

Removable Transducer Mount

Transducer Mount

The instructions below detail how I created my transducer mount to attach my Humminbird side imaging transducer to my Wilderness Systems Commander 120. After exploring multiple options for mounting the transducer, I couldn't find a solution that met my needs so I sought inspiration from other implementations and came up with my own. I wanted my mount to:

  • Be Completely Removable
  • Create Minimal Drag
  • Be Protected From Objects in the Water
  • Have A Clear Line of Sight on Both Sides

The transducer I came up with uses the existing threaded holes for the rudder on Wilderness Systems kayaks. It is quickly assembled and easy to remove.

Materials Needed

  • 1/4-20 x 2" Carriage/Step Bolt (Qty. 1)
  • 1" Ram Double Socket Arm (Get 2 for $16 at YakAttack)
  • 1" YakAttack Screwball (Qty. 2) Get It
  • 3/4" Deep PVC Coupler
  • 3/4" PVC Plugs
  • PVC Glue
  • 12" 1/4-20 Threaded Rod
  • 1/4" Lock Nut

Step 1

Using a Dremel or hacksaw, cut off the 1/4-20 x 2" carriage/step bolt to roughly 1 5/8" and hand screw it into one of the YakAttack Screwballs   (set aside). To ensure the correct length, you can screw it into the rudder hole on the back of your kayak, and mark where to cut off the excess.Screwball Assembled

Step 2

Glue the 3/4" PVC Plugs into the 3/4" Deep PVC Coupler. This creates what would appear to be a closed capsule.Assembled PVC Capsule

Step 3

Use a 1/4" bit to drill a hole in the center of each cap. An easy way to start your hole in the center is to place the other Screwball on the center of the cap, and tap a nail in the center of the Screwball to mark your starting point.Capsule with Holes

Step 4

Using a dremel or hacksaw, cut the 1/4" threaded rod to roughly 5 1/4". Begin threading the rod into the existing center hole of the plastic bracket that comes with the Humminbird transducer.

You may need use a smaller drill bit to widen the hole to allow the rod to thread easier. Use a pair of channel locks with a thick rag over the jaws to turn the rod without ruining the threading. Place the 1/4" locknut snuggly on the bottom of the rod.Threaded Transducer

Step 5

Place the PVC capsule you created onto the threaded bar.Threaded Transducer with Capsule

Step 6

Place the 2nd Screwball on top of the threaded bar and tighten.Threaded Transducer with Capsule and Screwball

Step 7

Remove the existing screws included with your Wilderness Systems kayak for the rudder.Rudder Holes

Step 8

Screw the Screwball created into Step 1 firmly into the top hole.Screwball in Rudder Hole

Step 9

Attach the Ram arm to the screwball pointing down.Screwball with Ram Arm

Step 10

Attach the assembled transducer. I chose to paint mine black using a flat spray paint.Completed Transducer Mount


Nice engineering :~)

Thanks!  It has worked out well so far.

Very nice install. I'm going to steal your idea.

Hope it turns out well for you...let me know if you have any questions.

Great job that is about the cleanest homemade mount I have seen.


I have been working on this very idea and your solution is perfect.

Thanks Ron!  Glad it helped.

your 2 links for the 2 screws balls dont work. i also didnt see the 2 for 16 on yak attacks web site. and i'm going to borrow your idea to mount my new fishfinder on my new ok trident 11

Works beautifully on the backside of my jon boat - everything about this was perfect - this allows the drill hole to be above the waterline, the whole design is flexible in the event you hit something unseen or bind up in the shallows the whole unit pivots on the clamped point and no damage comes to the transducer.

Glad it was helpful Ken!

The Mount is in my Production Phase, just ordered the Screwball, have all the other material. I have been searching for 5 Months, and this is the Most Practical, Inexpensive, Easy and out of the way Mount for True readings for my Fish Finder...Great Idea, Great Concept, will finish next week, and on the water the following.....Joe

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