Observed first hand at Rallies...
Overtightening a Canyon Dancer can bugger up the throttle tube on a Stella right now. It is a pretty simple fix involving removal of the headset cover and straightening of a thin brass looking guide. You'll know right away when it happens; once fixed you won't overtighten again. Better to use the seat pin and a couple of those cinch straps once you have the Canyon Dancer just snug enough to hold the Scooter up.
Make sure the fuel tap is off before you transport!
Many a Lambretta have suffered broken alloy headsets from overtightening a Canyon Dancer. Better to use cinch straps below the Headset.
Ratcheting straps suck, the manual type are a lot easier to judge tension.
That metal flange DaBinChe uses is also available at Tractor Supply.
Any loose strap will slap the paint enough to bugger it up, take a roll of 3M Super 33+ electrical tape to hold down any loose straps.