Lee Valley Tools is selling these kits based on a 2007 design by a bright young teenager. It's worth checking out the wooden freewheel-ratcheting pawls system he developed as a school project. Mad skills for a 16 year old.

Thanks for sharing that. Very cool, and fun reading his description of the process.

I recall one freshman engineering project where each student had to design and build a bridge structure of defined minimum strength spanning a given one-foot distance between endpoints. The requirement was that the bridge could only consist of paper and glue, with as little material used as possible.

So I zig-zag folded a long, 1-foot-wide strip of paper, applied paper sides to it then dripped the specified rubber cement (I thinned it with solvent) down it's length to bond every folded edge with the outer paper sides. After the solvent dried it was quite light, stiff and strong, easily winning the competition of sorts that had been put forth.
I pondered whether I had cheated by using the solvent, but the solvent wasn't there in the finished product so I was chill with it. The professor by the way was from France, and once spent nearly an entire session extolling the merits of his air-suspended Citroen car, a true believer enthusiast who showed his patriotism that day.

The real value however of having students build things is more in the difficulties in realizing expectations, such as this student's overly-energetic ratchet springs. Teaches them not to expect instant success, the value of perseverence and developing problem-solving skills under pressure of a deadline.

Good thing it's a single-speed, as that chain would not play well with index shifting.

But the freewheel "pawls" have a lot more redundancy than your common mass-produced freewheel or freehub, even with half of them decommissioned.

So, does Phil Wood make a tung oil?

No but Lee Valley certainly does.

But do they make a size that fits in a seat bag?