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I know someone who has one of the Johnsonian platforms for his 15" dob. I've never liked it. The construction appears very dodgy, and this person has had to replace the motherboard at least once, I think twice. Also there is poor design in several aspects, such as the cable between motherboard and top platform/dec motor not having a easy plug, so what happened to this guy is the cable has got ripped out of the motor (hard to see what's going on when you're packing up in the dark, things need to be clear and easy).
I'm trying to find a replacement stepper motor for him at the moment and in the past have re-soldered the battery cables on (they came off) and resoldered some other stuff.
Also it amazes me how much aluminium is in the thing, there must have been almost no profit on it, because the thing consists of so much solid and honeycomb aluminium.
To be honest, considering the only one I have seen, I'm not surprised he has given up on the business.
Still though, it is a shame that someone/anyone has to give up on their choice of a business, their dream of making something successful, and go back to a "9 to 5" or whatever it might be.
Roger.
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