Ebrush Sharpie Adaptors

A friend of mine has a Ebrush (airbrush) from Craftwell and is finding it hard to get the sharpie adapter here in the UK - unless they pay over £30, way too much for a lump of plastic. so I'd like to try modelling one for them. but no idea how to do it.
the adapters have a bayonet type fitting inside them to hold them onto the 'pen' of the airbrush. would this be easy to produce? guessing it does not have to be the same shape outside so long as it fits the airbrush and holds the sharpie at the right angle for use


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