This is interesting. The 3mm 53 single does indeed look like a 3w engine. It has all the same shape and style, the cylinder could have been copied from 3w (with some changes).

It seemed natural to me to use two of those cylinders on a twin, but instead they made a whole new cylinder that looks like a DA on the outside while still looking like a 3w on the inside.

Anyway we should know more soon.

TF