Originally Posted by dtomko

I cloned the Sprite from a Scout II kit and used the included 13mm adapter, which is about a 1" long BT-5 to BT-20 centering ring (like a thick coupler) holding a BT-5 with engine hook. Yes, the Sprite was listed as a Mini Brute for a while, I believe. It's not in the catalogs, but I recall seeing one on eBay a while back that had the Mini Brute logo on the card. Anyway, I am pretty sure the 13mm plans are exaclty the same as the short 18mm, but say to use the 13mm adapter.
Drew Tomko