It looks a lot like one of the generic clones of the Rong Fu 45. I would check Grizzly for a on line manual.
For slinging , I forgot how I did mine, but if you use a nylon sling and double wrap the column , crossing your eyes under the gearhead. That should get you close enough for your balance point. A nylon sling will choke on the column and carry a fair bit of weight. Lock your head, and for the sake of your feet, stay out from under it.