Had to replace depth and speed sensors back in 2012 and I believe after I got 
the senors out, I had to cut the plastic sleeves to break them loose from the 
hull.  Mine were flush mounted and faired in, so I think I ground away the 
fairing using a dremel, and then used a hacksaw blade on a handle through the 
hole, to slice the plastic sleeve, and then I pry ed them out individually. 

The tricky part for me was caused by the newer sleeves being a size larger, so 
a friend gave me a tip.  You find a holesaw the same size as the exiting hole 
and drill through some wood to make a pilot guide the same size as the hole you 
want to enlarge.  Then you put the wood plug you made onto the pilot bit of the 
larger holesaw pilot bit, and it will keep the bigger holesaw centered and 
Bob's Your Uncle, you're all set.

Good luck.  Let us know how you make out.

Chuck Scheaffer 1989 C&C 34R, Annapolis 

>     On 02/20/2023 12:01 PM John Heaton via CnC-List <cnc-list@cnc-list.com> 
> wrote:
> 
> 
>     Hi folks - I’m looking to remove my original Data Marine instruments and 
> wow did they find the most difficult place to install the depth and speed 
> transducers. I’m going to leave the depth in and replace the speed transducer 
> with a new airmar transducer. 
> 
>     I’ve been able to unscrew the old transducer but it will not release. 
> Does anyone know how they were installed (epoxy, 3m 5200) as they will not 
> come out even when hitting the top with a rubber mallet. 
> 
>     Thanks
> 
>     Double on the Rocks
>     Toronto
>     Please show your appreciation for this list and the Photo Album site and 
> help me pay the associated bills. Make a contribution at:
>     https://www.paypal.me/stumurray
>     Thanks for your help.
>     Stu
> 
Please show your appreciation for this list and the Photo Album site and help 
me pay the associated bills.  Make a contribution at:
https://www.paypal.me/stumurray
Thanks for your help.
Stu

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