So, I know there are threads out there about how to make bushings from wheels, but hopefully this one is a bit different in that I found some little details that make sure you get a full set of good bushings the first time you do it even though some things may seem like common sense. Also, it is specific to Otang in heats.
What you need:
1) Holesaw (1 1/8")
2) Zip ties (if you don't have vice grips)
3) 3/8 drill bit
4) hack saw
5) belt sander (for those of us without a lathe)
6) Mask (urethane dust is bad stuff)
Step 1: If you don't have vice grips mounted on your work bench, drill two holes that you can loop a zip tie through. the zip tie will go through the wheel and fasten it to the bench while you are drilling. I also used a door stop to keep the wheel from rocking when I was drilling the preliminary hole.
Step 2: Once wheel is fastened, measure 1cm in from the inner wall of the wheel (specific to in heats) and draw a line. This is where the urethane is thickest and it will be the outer edge of your bushing. with the holesaw, drill 1/4 to 1/2 way through the wheel at a medium speed, not forcing the drill too much or the urethane will melt and gunk up your bit.
step 3: take the 3/8 drill bit and drill all the way through the wheel and core in the center hole made by the drill bit of the hole saw. If you try to drill this hole before the holesaw, your bushing may not be centered. If you try to drill it after, it will just spin and not drill through correctly.
Step 4: finish drilling your hole all the way through the core. the section of wheel is now probably stuck in the hole saw and is very hot. Just grab some pliers and twist it out or be a man and twist it out with your fingers.
Step 5: cut the section of core off the urethane with the hacksaw, try it keep it as straight as possible.
Step 6: If you don't have a stationary belt sander, take your hand belt sander and flip it upside down and attach it to your workbench. I used the same hole I put zip ties through to attach the handle of the belt sander securely upside down on the table. This may not work for all sanders, but it does for the crappy chicago brand one I got from harbor freight. turn it on and push in the "hold on" button so you don't have to have one hand on the trigger while you shape the bushings.
Step 7: using a heavy grit, smooth the top and bottom of your barrels. Only hold the bushing on the belt for a couple seconds at most because it is very easy to get lopsided. If you are afraid of losing some skin off your fingertips wear gloves, but it really doesn't hurt that bad if you touch. At this point you can also bevel the edge of your bushings to make cones and all sorts of funny shapes. You may also have to adjust the diameter of your bushing depending on thick your holesaw was. to do this either carefully do it by hand, or put it through a pen or pencil and let it roll on top of the belt until round and smooth.
Step 8: Get out there and ride.

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