I would suggest that we take the guns one at a time.
Maybe start with the Kettner. It should be the easiest to pin down.
We will need as much info as possible and pics will go a long way in helping in helping you to understand the gun.
This could be both fun and may help others a bit.
Best,
John


Humble member of the League of Extraodinary Gentlemen (LEG). Joined 14 March, 2006. Member #1.