Well done Barry,
experimentation is the greatest learning tool to man...
but you must make a hartman mask, once you sued one, you'll never ever turn back.
I in fact use on one mys copes, my camera's ( big lensed SLR film oldies and even on my digital Nikon Coolpics)
With the mask you forget about the half-moon rubbish and battling to focus. It's as easy as pie with the mask.
for the Smaller digitals, I get a plastic cap to go over front of lens. Mine takes a old medical bottel cap, that I have now drilled three nice 4mm holes into in a triangle. A mini version of the scope cap shown in the link I put up.
This single item, together with my heavy duty tripod, made my astronomical life a million times better.
here is an example of the focus you can get.... crisp to the "t"
Tony