Micro-Maxx Estes Fat Boy, Part 4, Nose Cone Plug

I didn't have a shoulder base for the old plastic nose cone.

Using the same material as the centering rings, trace around shoulder end of the nose cone with a sharp pencil.

Cut just inside the pencil line with scissors.

Round out the base with 220 grit on a block.

Sand, check the fit and sand some more until you get a slip fit.

Glue a reinforcement strip to the inside.

Punch two small holes for shock cord attachment.

Tie a short piece of elastic with a square knot.

The plug is set just under the edge of the shoulder base. By insetting the plug under the edge allows you to add a glue fillet.

The glue fillet was made with Fabri-tac glue.

Micro-Maxx Estes Fat Boy, Part 2, Centering Ring Fit

Left side picture:

Two uneven, rough cut rings stacked for gang sanding to fit.

Right side picture:

A 1/4" diameter dowel was slipped in for strength while sanding the ring sides even

Sand, test fit and sand some more until you get a good friction fit in the BT-20 tube.

The finished mount with a MMX motor slipped inside to check the position of the engine block slid in from the top.

The finished mount will be glued in with the motor extended a little beyond the edge of the BT-20 tube.