Hi John, Thanks for the pix!
I think I've found a way to make it work. 1. Got some brass tubing that is just about the same diameter as the rg-8's center conductor & poly. (might have to use some silicon grease to make it slide a bit easier). 2. Solder top of brass tube to side of the heliax's copper center conductor. 3. Wedge some foam or other non-conductor down inside the heliax to make sure the brass doesn't move around. (this shouldn't have any affect on the capacitance between the RG-8's center & the brass tube). 4. Solder brass screw with 2 nuts to end of RG-8's center conductor. 5. More mechanical stuff here, but too many words to use. Will take pix when I'm done. thanks, Tim