[AdeC]

TBH the delivery isn't top secret, I was just panicking it wouldn't arrive in time for me to put it together and test.
I wasn't happy with the chassis, so I ordered a replacement.
All my own doing as I had the car sat with a pile of parts since around Feb, but I was busy working on my model railway so hadn't been near a slot car for some time. 
Then I realised I was running out of   

Did a similar thing, was confidently sat on my Alfa 156 build for months, put it together last minute only to discovery the Slotting Plus chassis was FUBAR'd. There was no getting it to work, so had to build a completely different car from whatever spares I had in my box, which had to be sent last minute with zero testing!