Front fork drop out spacer 9mm axle

This is a spacer to put between the drop-outs on your front forks when you've removed the wheel. Useful when transporting your bike (especially if sending in a bike-box on an airplane) - it stops the forks getting bent.
Was packing my bike & couldn't find one so made this.
I measured my drop-out/axle on my commuter bike with digital calipers and it read 8.8mm, so the maximum width of this spacer is 8.8mm and seems to give a snug fit when installed - see photos. It is too small for a 10mm drop-