An idea from many years ago:
If you replace the solid steel axis of the barn door for a steel pipe, you will obtain a hole that can be used as a polar finder.
I my wood traking toy (I made it for the Hale-Boop ...) I use, instead a barn door, two wahsers in order the angle I can see trought them is the same that the circle that Polaris have. Placing Polaris in the adequate border of the second washer I achieve a very precise Polar alignment, enough for a 300mm. telelens.
With the apropiate distance between the M6 screw to washers for to need a complete tour each minute and a clock glued in the know I can have a good traking simply moving the know for to have all the time the ¿second arrow

? of the clock pointing to me.
https://lh4.googleusercontent.com/-b.../58soporte.jpg
Easiest, but not so funny to do

is the use of half Superpolaris mount.
https://lh3.googleusercontent.com/-n...ont-eclpse.jpg