I finally got around to trying out the 10" Skywatcher circle with my 6" Skywatcher and it was a perfect fit. It was only $2 to print it on an A1 sheet at officeworks and around $10 to laminate it once I had cut it out. I glued it on the bottom layer of the dob mount and cut a 10 cm x 3 cm slot in the top layer on the viewing side with a small jigsaw. I hammered in a small pin for a pointer. I tried it out tonight and it works a treat! I was easily able to quickly find many faint globular clusters up to 6.3 magnitude on my 6" scope. As you can see my altitude scale is still pretty rough and ready, I got the angles using a gyro/compass app on my ipad called "spyglass".
Again many thanks to richardda1st for your efforts!
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