Drill Helper 2    help keep your electric drill vertically :P
First you need small 10 mm aluminium pipe .Cut on 5 cm .
Create inside largest possible hole with drill bit or carbide cutter.
Object is from 2 parts.Glue 3D Printed Parts Together.  You can try use glue to keep pipe inside.
Enlarge the hole inside aluminium pipe THE DRILL bit MUST NOT BE TIGHT !!!
----------------carefully with the drill bit temperature-------------------------
For 8 mm drill bit
1x   5cm  aluminium can be use   for all Drill  Helpers  1 and 2
Drill Helper  1https://www.thingiverse.com/thing:3145393
Use a drill   8,44 mm (or find same size)     to form a hole in the aluminum tube

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