Brooks I think Jonathan is talking more about the spring that goes between the tailwheel assembly and the fuselage rather than the steering springs.
There is a safety update about reinforcing the longeron junction here, which also includes a warning about making fast turns on rough ground...
How are the vertical sections aligning along the posts where the windshield transitions to the upper side windows? Those might give you a data point about channel depth since channel depth impacts alignment there. Also, if you lay a straight edge along your wing leading edge, how is that...
I don't know about the seaplane doors but for the skylight I used a foil bubble wrap that is popular for insulating pole barns, with magnets held to that by tape.
No, the engine should not be shutting off when you pull the mixture back one inch from full rich.
I would first confirm that the knob travel is matching the lever travel. This may require two people and may require disconnecting the linkage at the front end.
The good news is that this portion...
The factory windows that I have experienced move the j hook forward to a location equal to about your fourth screw, counting from the front. This moves it out of the arm travel area. This is a mod that you could do to your existing window but it would involve welding and painting.
Install the wheel and decide on an orientation and tension for the nut. Mark a sharpie line across the axle and nut. Count the turns as you remove the nut and wheel. Reinstall the nut without the wheel, countng your turns until you restore the nut's desired position. Clamp the nut to prevent...
You can try bending them cold, but the ideal path would be to heat treat them back to soft, bend them, and then heat treat them back to springy. I was in your shoes at about the same number of hours and just obtained new springs. I guess back in the day just about every town had a spring shop...
Here are some pictures I took at Oshkosh. I don't know if this tire fits your fork or if you'd need a new one, but Virgil would be the one to ask. https://bearhawk.tips/7536 Scroll down to pictures 4 and 5, and you can click on the small picture to see the full resolution.
Build up a test rig with a party balloon on one end and a cap on the other. There might be more if you are testing the line and the whole tank, but you get the idea. The key is using low psi, hence the party balloon and not a pressure guage and shop air.
I didn't stress too much about it. There are so many rabbit hole opportunities that I have to choose carefully which ones to fall into. I have had fittings that leaked, most often because I forgot to tighten them. Sometimes because I didn't make a good flare. Excepting those cases, it just...