A 24mm adapter is included in the box.
The purple tube is a spacer slid into front of the mount if a shorter D motor is used.
An addendum sheet is included to show the construction of the 24mm adapter.
Any experienced builder would have no problem figuring it out from the illustration. No real instruction copy is included.
GOTCHA: In the assembled view - Notice the rear black ring is shown even with the lower end of the 24mm motor mount tube. This won't allow any flex of the engine hook.
TIP: I'd recommend gluing the lower centering ring about 3/4" up from the rear of the tube.
Two 3/16" diameter launch lugs are included.
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