Jan,
If your friend would like, I'd be happy to 'fix' his leaking hatch for him. I'd even return the boat some day, maybe...
Not being that familiar with the Aziz, if the hatch is in the rear deck, clear packing tape works well. Doesn't look very nice but will keep the water out. Ran into that problem with another of 'Slipways's kits, and from a distance you can't see the tape much anyway. Saw something about using some flimsy plastic wrap and silicone as a seal, been thinking about that.
Oh well, don't expect I'll have to watch the mail for a large package so guess I'll just have to admire the 'Aziz' from a distance...
- 'Doc
PS - Reduce the ballast a little?