08-04-2010, 08:50 PM #1
Making a Surfmaster PI Pro Coil Sink
So I got one of those foam filled floating searchcoils that came on the used unit I bought dirt cheap. It didn't come with the epoxy filled sinking diver coil.
Pretty annoying to have the coil want to float upwards as well as needing extra muscle to keep it down....
Decided it needed weight, I actually made a quick mold using the coil and scrap cardboard.
My first attempt molding a weight was a bit heavy, to much weight in the tip area.
Decided to make another again using sand and epoxy resin I had on hand using what I learned from the first weight..
I mixed up exactly 10 oz. of sand with 5 fluid oz. of mixed 2 part epoxy. Stirred
the sand in until it was a nice thick paste like texture. spread the mix into the mold
with the majority of it pushed back to the rear of the search coil. Tilted the front
of the coil upwards to make sure the mix would not flow towards the coils front.
I popped it out of the mold, it weighs in at 13 oz.
Placed it back on the coil, filled up a tote with water
and placed it into the water. 13 oz. is the perfect weight that will make the coil slowly sink
The weight has now been painted white, a few days of drying and it will be ready to use.
Still deciding how to attach the weight so it is removable for dry sand hunting. 2 sided tape, velcro, cable ties...
08-04-2010, 09:49 PM #2
- Join Date
- Jun 2010
- Mariposa, Ca (49er Gold Country)
That is an awesome job in solving that problem.. wtg
08-05-2010, 05:06 AM #3
Pretty kewl. We used to use a bag of glass marbles tied to the shaft ....If there's anything I hate worse than diggin' pulltabs, its missin' a gold ring.
08-05-2010, 05:18 PM #4
Kooks good,,, Thats one way to skin a catIneptocracy [in-ep-toc'-ra-cy] - a system of government where the least capable to lead are elected by the least capable of producing, and where the members of society least likely to sustain themselves or succeed, are rewarded with goods and services paid for by the confiscated wealth of a diminishing number of producers. There are three classes of people: those who see...those who see when shown...and those who do not see. - Leonardo da Vinci
FNH FNX 40
08-07-2010, 05:18 PM #5
great mod i would attach it with velcro cable ties
08-07-2010, 05:28 PM #6
very clever!!!*************************** To errr is human.....To arrr is Pirate **************************