I haven't had much nice to say about the JD2 Bender...ever. With some manipulation, it's possible to make it usefulish. I've been struggling to bend seat tubes for a while now, having sent out hundreds of $$ of material only to have half of it come back useful. Now I have a bit more hope.
Basically, all you need is a "follow" block and something that puts pressure on it. As a quick and easy proof of concept I turned down a 7/8" bar and popped some bushings into the JD2 frame. I used a crappy harbor freight hydraulic ram and the SWAG offroad holder to make it easier...mostly to prevent the backlash normally present when using the ratchet mechanism.
what's also needed by VertigoCycles, on Flickr
What's needed by VertigoCycles, on Flickr
1 3/8" tube bent by VertigoCycles, on Flickr
I'm going to machine a new, larger radius die over the weekend and will sell this one. I've also started designing a "roller carriage" that uses a screw to jack it into the follow block to eliminate all of the slop...that will hopefully eliminate the slight denting, but even if it doesn't this is the most functional this bender has ever been for me.
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