Hi Maddog,
With my tube jigs a regular 1/4 to 3/8oz regular ball head jig works OK. Placing it in different areas of the tube jig will affect how it sinks in the water.
If you place the ball head all the way up to the front of the tube it will fall straight down the further back you go with the jig the more of a spiral action to the fall of the tube, especially with the lighter weights. Adding a small rattle chamber ahead of the ball head is another good option if would like some additional sound to you presentation.
The other option is using a standard tube jig hook. They are usually oval shape so fit the tube fully.
Check out tube jig heads at tackle warehouse for the different styles out there. --->
http://www.tacklewarehouse.com/Tube_Bait_Jigheads/catpage-TUBEJIGS.htmlThe tube jig head I use is similar to the "Danielson Tube Jig Heads 5pk".
Hope this helps.
WW