AlanD:
The Harris Patent magazine filler was usually referred to as Punchard's Magazine Filler, but no-one seems to know why!

Here is a thread showing the example in my gunsafe, and there are pics of Huvius's rifle posted about the same time (Jan/Feb 2009).

Hope this helps.

O&BTW, great to see web-pages devoted to these marvellous old rifles, thanks Roy! Love this stuff!