Ever MAKE your own tools?

Sometimes you need a tool that nobody makes. Sometimes the tool is available but it costs too much.
I'm planning a cam swap in the Charger. Part of the job includes changing the valve springs. I called Summit for a Powermaster spring compressor, but their ETA for delivery is 2 weeks! Being the anxious type, I went to my metal scrap stash and made my own. For about $5 in materials, I have my own. The welds are sloppy but strong.
Please forgive the Harbor Freight orange color of the paint. I just wanted a high visibility color.
What tools have you made for a difficult job?