Can anyone Identify this furler?

[charles_reed]

I've used the feeder on a strop that everyone is describing many a time, while these are great most of the time, in this situation they won't hold the sail luff with anywhere near the precision it requires to not jam.
I'll send an email to Z-Spars, and see what they think.

As has been said, its possible the luff tape is incorrect, but once fully in, it slides within the foil no problem.

I can confirm this point to be true, having tried an external feeder on a string - in the end I got a feeder from the foil manufacturer (in my case Rotostay) - I understand that all roller manufacturers buy in their foil section - so, though better to know the exact manufacturer, in theory any roller headsail manufacturer should be able to supply one.
From memory the part machine-screws onto the foil so one needs to tap the hole and use Duralac.
I suspect the unit to be an early Facnor - see here http://www.facnor.com/uk/products/headsail_furlers/