New tube, rigging ?

[TubeDude]

It's all part of the adventure. More fun customising yourself.  I read your link above, nice writing.  Very informative.  Between that and Youtube it was off to the races.
All I think I need at the moment is a long bolt (3 1/2 inches) to go through the frame and transducer swing arm.  I hope I can find a big wing nut to go on the outside to make it easy to loosen or tighten up or down position.



I need a new battery.  I'm just going to put it into the pocket of the tube with the excess transducer and battery cord.
Any battery recommendations?  Is 7Ah big enough or is a 10 or 12 Ah better?  My finder has no gps or fancy things I think the draw is 150mil amps.  I will stick with lead/acid sealed because I'm cheap like that.

I have found several longer bolts and wing nuts that fit in the nuts and bolts department of Lowes.  

If you have a basic sonar...no color and no "advanced" functions like GPS, down imaging, etc...a 7Ah SLA battery will run a whole day of fishing.  That's all I used to use.  But once I moved up to a Helix with color I found I needed a 9 Ah if I wanted to stay on the water more than a half day.  And the 9 Ah is only very slightly bigger and more expensive.  Just be sure you also get a good low amperage SLA charger with an indicator light...and a voltage tester to check periodically.  Get in the habit of topping off the battery before a trip...and putting it on the charger as soon as you get home.  SLA batteries are not meant for deep cycle use and it is not good to keep running them to failure between charges.