It was this circled in red...



If they existed commercially (with 8mm bores to slide over my stepper shafts), then I'd likely grab a few ....I need to mount different types/varieties of backplates to a stepper shaft (for exploratory winding of coils, pickups etc).

if they don't exist commercially, then I have a big lump of cylindrical ali stock still left here, that I may commision one of you fine fellas to turn down for me (it would be like an elelphantitis version of the thing I circled in red!) ...I have previously made what I need (I'll take a photo later) but because I suck at anything to do with lathes (actually you could extend that out to anything to do with machinery in general!), it didn't turn out that accurate!