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If you buy them in pairs, you save a couple bucks, but 2 will run you around $100. I keep meaning to bring mine to a local metal fab shop to get a price to get one built, if I provide them the ball bearing roller supports. It's not like it's a complicated design or anything. I like them because they are easily moved, adjusted for height & guide spacing and using the lead weights on the ends; stay put on the table for thread work. You can get the 2" dia. ball bearing roller by itself for about $15, or the 1" for $6, but I'm looking at an old catalog.
They aren't cheep, but they work great and you might want to consider the rollers in your design. I like the 3rd roller on top, and the fact it can be secured in place over the rod. That prevents the rod from accidentally getting knocked on the floor if I happen to catch the end, or if I get a call or something, I can reach over to the closest and tighten it down on the blank to hold the thread tension. It also comes in handy come time to tighten up a decorative butt wrap. I have one under the handle and I can push the top roller bar firmly on the cork handle and keep the rod pretty secure as I work to tighten up the patterns on the top.
Good luck and tight lines.
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Threaded Mode