That's fantastic! I even have 90% of a roll of that metal tape left over from earthquake-strapping my water heater. AND, I already used that stuff to jimmy up little extendo-holes, reaching up from my rear-axle rack-mount screw-holes, so that when I use a seatpost rack with panniers, the short hook-straps can reach something and cinch tight. (does that make sense?)

This is the solution I will use, much easier than a little wooden block full of holes. And probably sturdier too.