arranj wrote:Size isn't important - .
Sometimes it is

here is a little tip that might be worth knowing for this and other US-UK purchases:
The US Postal Service (USPS) has a set of fixed price flat rate branded boxes that can be very useful for mailing heavy items. E.g Small, Medium and Large
https://store.usps.com/store/browse/usp ... ernationalFor example if you had 10lbs/4.5kg of DeLorean parts in a brown cardboard box, posting by weight at USPS would cost $81.
However, if that same 10lb fitted inside a USPS Flat Rate branded box, that would only cost $60. In fact you can ship up to 20lb max in that box for the same $60.
So in the OPs case, if he could stuff 20lb of motors-only in the Flat Fate box it could be quite economical. The physical size of the assembly will probably preclude that, though.
And why do I use the US Postal Service to mail a letter, whereas you use the Royal Mail to post a letter?