Howdy all, I have a Chandler C-75 that I also believe is a clone (looks exactly like the Mitsubishi DU-105) and am having what I think are timing issues, it's just incredibly unreliable.
I am using 135x17 needles and was wondering if maybe that was the problem, the hook actually bends the needle as it rotates, nothing in the two 105 manuals I've found about timing and no way I can see to move the hook assembly like you would on a vertically oriented bobbin, incredibly frustrating!
Of course this is the first industrial machine I've owned and I've never had a more unreliable machine.
Any kind of help would be greatly appreciated.