This post is aimed more to a novice enthusiast.
DO NOT ATTEMPT TO RE-LOAD A USED ENGINE CASING!
This post is about reusing a casing to make painting wands, centering rings and engine blocks.
Don't throw away all those used engine casings.
I might save one clean casing out of every ten flights.

Turn a flat blade screwdriver inside the top end of the casing.
You can see how much crud is left inside a used engine.
Do this over a trash can. Your wife will thank me.
Without knocking out the nozzle, the casing can be set over the end of a dowel for use as a spray painting wand. Use some masking tape to friction fit the casing on the dowel wand.

It's easiest to cut these using a fine toothed razor saw in a mitre box.
You can also cut a 1" long length off a used 24mm casing for a D engine "spacer" in a rocket designed for the longer E engines.

A 13mm engine can be friction fitted inside an expended 18mm casing.
An 18mm engine can be friction fitted inside an expended 24mm casing.
Sometimes you'll have to peel a layer of paper off the inside of the expended casing to get the smaller diameter engine to fit.
NEVER PEEL OFF THE OUTSIDE LAYERS OF A NEW "LIVE" ENGINE TO GET IT TO FIT INTO THE LARGER CASING ADAPTER!
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