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Elite Member
I made one for mine 3' extra did what Sodamo picture shows, it worked fine, and that was in heavy clay and rock soil.
I did that. Needed to auger minimum 60" with the 12 inch. I made a sleeve/pipe extension with the bolt holes. As I recall (almost 5 years ago), I used a pipe within a pipe. If I can find it, I'll post a pic if you like.
Here are some action pics.
Only had to do 9 holes, took our time.
Looking at your third picture it seems that the PTO shaft has a sharp angle to the gearbox. Does that cause any problems with the gearbox wearing out or seal damage? Bullbreaker posted a manual for a Comer PHD gearbox and I noticed in its trouble shooting pages that it mentioned having too sharp an angle for the driveshaft causing a problem. If you only had nine holes to drill with the extension it probably didn't matter but for extended use could it cause problems? The trouble shooting pages even mentioned not leaving the auger engaged when going from hole to hole to minimize the rotation time when it was at this high point in the lift.
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Ok, here's mine.