O.K. done, sorta I couldn't find a bus door lock And at this time of night I'm not banging around in my shed with a flash light. Anyway I did it on a bug handle year unknown . I remove the scew from the back , the tumbler slid out , put in the key pulled it out moved the tabs around . repeted this until it worked. I had a hatch lock but i didn't have the right tool to get the c-clip out . If you need some door handles from a bus I have a couple in the shed you can have free. you pick them up and I will give you a run down on how to do it.
Chris