Show that block when you get it perfected. It would be interesting what it looks like and how you use it.
Honestly, I don't use tubes but maybe once during a summer season. I have a real passion for paddle-tailed baits like the Thump-Its when it comes to crappies and pannies. When I was cutting my teeth on plastics 45 years or more ago though I ordered every color and in both sizes that Bass Pro offered and two packages of each. Tubes were all I used for three years and during that time I never bought live bait of any kind except during the winter. What an education that was. lol
Les...are you in an area where you can ice fish? Those 1 1/2" tubes can shine under the ice when chasing crappies if you focus on the fish at mid-column, the ones that show up on the flasher for ten seconds then fade out again. Hang that tube a foot above the mark. They'll hammer it.