Thanks to Hobie for referring me to Mr Jurras!

I registered on the Leverguns Forums on Hobie's advice and Mr Jurras will be sending me pictures and details of the Howda guns that he designed and made in the 1970s I think. I shall try and scan and mail them to NitroX and we shall be able to see them here in a few days' time.

Thank you, Hobie and good hunting, gentlemen!