Is the Compact a different size?
If the Compact is the had the base of a smaller Numatic like the James, would it not have the 'dip' in between the castor wheels? I think that it is a completely different size to the 300 that we are used to using. I may be wrong though. I found a photo of a Henry with a smaller 180 type base. It looks different to the 180 (compact)in the photo of all three vacuums. I have a photo of the James base (and annotations thanks to Snapchat 
) and also the Henry I found on Google images. (Sorry about the photo of the Henry, I forgot to crop it)
Thomas.
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