Update: I decided to order a brushless kit from China. The deciding factor was the ability to have the lathe (Micromark 7x14) something like the stock setup. I like having a rotatable control for speed, and a Fwd-Neutral-Rev switch, and didn't want push-button controls.
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I ordered the kit on May 16 and it arrived on my doorstep May 26. Excellent packing, and the parts were pre-wired with connectors. Connectors were all different (type & number of pins), so it would be almost impossible to make a mistake.
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I made a new motor mount with material I had on hand, and fabricated a new control box. The brushless controller board is too large to fit in the stock plastic electronics housing on my lathe, partly because of the box size and also because of the control layout. I added a heat sink to the controller which has a substantial aluminum plate on the bottom.
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I changed the power cord retainer to a plastic gland style to give a bit more room under the motor cover. It's a tight fit but everything fits OK.
The controller has 5V DC output available, so I was able to power the stock tach (which uses a pickup and a notched disk inside the headstock) from that. My Micromark is an older model which has a separate 5V power supply in the enclosure.
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Total cost was about $380 CAD or $275 USD. This includes the $55 CAD in tax and brokerage charges, which I paid to DHL online before the delivery date.
I haven't done any serious work with the lathe since I finished the upgrade earlier today, but the low speed torque/performance is definitely a lot better.