Wow, I had no idea!
I’m finally getting ready to build myself a BMX frame. First things first, the pivotal seat clamp arrived.
I got this part 3D printed out of 316L stainless and I plan to silver braze it into the seat tube. It’s designed for a 29.2 OD tube. Once I had the part in hand, I decided to make a small change and add an internal rib for strength. If anyone wants one, I’ll gladly share the files with you. Just shoot me a message.
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Good times!
Looks great 
Nice work on the pivotal post, that’s been on my list of things to tackle, just need to find the time. Where did you find the spline dimensions?
I just did some measuring and a plastic test 3D print. I’ll send you the file if you message me your email.
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Not worth a build thread but after I built the white bike, I realized my black one was too long. Thought about selling the frame and building a new one but since the only thing I wanted to change was the reach and I couldn’t recreate these investment cast dropouts and yoke for any money, I did the next best thing,
New 5" headtube from @BikeFabSupply and shrunk the top tube from 21.8 to 21ish, gonna reuse the stock tube gussets and give it a quick re-spray. I’ll put a few pics when it’s done.
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