I have the Bogert tow bar for my RV-7A. It works well and is quite durable. However, I've always felt that carrying a steel towbar in my aluminum airplane has to violate some fundamental law of nature (I'm not sure which one). With time on my hands and a willingness to steal ideas from others, I built an aluminum towbar from a crutch. Weighs about 1/3 of the Bogert unit. You have to be more gentle with it than the Bogert bar, but it works quite well! Here is a link to the Flickr photo album:
https://www.dropbox.com/sc/51pnnv5ixlpw0kp/AAAD0dUWSA-h3bGW1JJxMXeza
https://www.dropbox.com/sc/51pnnv5ixlpw0kp/AAAD0dUWSA-h3bGW1JJxMXeza
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