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Hello everyone!

So, I just bought this StoneMaster four wheel cabbing unit for 200 bucks. Everything works great (besides water system) and is in really great condition. I was really surprised to find a unit like this in this condition for so cheap! However, I can't seem to find anything online about this unit at all. Is any body familiar with this brand and unit? Do you think I got a good deal for this despite it being such an unknown unit seemingly? I've never owned a cabbing unit at all or even used one. Anything I should look out for to make sure everything is in order? What wheel grits would you recommend? It has two new wheels on it, but owner (was his brothers unit) didn't know what grit wheels were on it. Is there anyway to tell what grits my wheels are that came with it? The unit itself has a neat feature where the motor tilts up slightly and lets you change what size pulley the belt is on to change the speed. What speed should I mostly be working with and how do I tell what speed each pulley wheel represents? And finally (sorry, I know a lot of questions!), the only thing that needs some repair/ modification is the water drip system. Any ideas what I should do for the water drip system with this unit? It has a water container with a spout, but there is no tubing connecting it to the unit itself. Do I just get simple clear rubber tubes and a release control valve and attach that somehow? 

Thanks!