Personally I don't believe that is good practice !!
Especially with Modified Motors (Shaft replaced etc), or when not running with a 'Retaining' circlip etc.
Whilst it may seem like the Magnets will keep things Aligned, in reality, it will Not, especially when running as an anglewinder but also as a sidewinder.
There is movement, driven by the gears and causes axial movement of the motor shaft !!
Fortunately, Plafit comes to the Rescue
as they have a Range of very nicely made 2mm Steel Spacers available in Packs of 100; 1.6, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5 & 5.0mmhttps://www.acehobbies.com.au/store/scr ... 8&limit=18
A standard Thin Armature spacer can be used against the bearing face to reduce Wear and Friction.
cheers
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