The engine block was notched for a better fit when butted up against the upper bend of the engine hook. This idea came from Todd. (Bradycross on TRF)
On the left you can see the split body tube over the engine hook.
The Kevlar went underneath the forward centering ring instead of tied onto the engine block ring. On larger diameter models it makes sense to keep the Kevlar away and outside the path of the ejection charge.
On the right is the finished engine mount.
Enlarge the picture and you'll see the filled spirals in the 3/16" launch lug.
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