Trivia.

[Dustydog]

Something about hand signals?

 

[Hutch]

No, your all wrong,I will give you another couple of guesses, it is a service tool for caravans and motor homes.

 

[Buckman]

It is a tool for the mastic.

 

[borderbilly]

Some kind of measure, gap thingy.

 

[Hutch]

Thetford Thunder box tool, I use a plank of wood. .