Quest/Enerjet Quad Runner Build #Q5016, Part 4, 4 Motor Cluster Mount

Here's the parts for the central engine retention.

Bolt, washer, 2 star center pieces and a wing nut.

As in the other larger Quest kits - 

The Kevlar is doubled, the loose ends tied to the 1/4" wide elastic using an overhand knot. Simple and no slipping.

One of the star center pieces is screwed onto the bolt, almost to the end.

Another overhand knot is tied at the center of the Kevlar knot. The loop is slid under the head of the bolt.

The upper star piece is screwed up and against the Kevlar loop.

The second star piece is screwed onto the bolt. 

This assembly is glued inside and between the four cluster tubes. 

The washer is slid on and the wing nut screwed on the end of the bolt.

The washer holds all four motors in place - no tape or engine hooks needed.