The black disc has a 1.5mm orifice and the ‘translucent purple’ disc has a 1.2mm orifice. It’s possible, of course, that the 4.6iS ‘034’ model has these orifice discs in a different order to the 4.4i ‘029’ model so you may well have these the correct way round – it’s just different to what I’m used to. Thought I’d better just check with you, though.

Phil