khouse
I like your idea, so not having a lathe, metal or wood, I bought a 3 foot length of 3/4" hardwood dowel at Home Depot then power and hand sanded it down to fit , then drilled and bolted. Mine is crude compared to your workmanship, but I think its functional.
I will be testing it at the beach in about 3 hours. It feels better and I have more control over sweeping the coil, while keeping it at a constant height, now if it just lessens the fatigue and I can cover more ground and dig more targets....
I also have a GTI 2500 and while it is well made, with lots of bells and whistles, I feel it is way too heavy and lacks balance. It is hard to use for hours at a time, especially in the summer heat. To me the 2500 feels like a pair of shoes that do not fit well. To the next person it may be just fine.
I plan on selling the 2500 soon and keep just the ACE for now. Whatever I buy in the future, comfort will be one of the things I look at. Is it reasonably comfortable, if not can it be made so?