Aaaaah, the old interior thing.
My thoughts - There's not a Slotcars on the planet that needs a little plastic head taped to the inside of the body.
For what reason?
I've always looked at the OUTSIDE of the car, I have found it pretty effective to this stage.
The only reason I ever put them in was because I was obliged to so I could race.
They add nothing to the cars in either looks or performance so why bother.
Ofcourse if you want to stick them in, go for it.
Please don't enforce a rule to cars that has no bearing on anything.
BRAD Y