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@O'Shane
^ your local bike shop should have a chain wear gauge.
I guess I could make a pattern and router the spider myself, simple enough shape. I think I'll go to the local machine shop and ask them a few questions before I proceed. I could even make a few different spiders for it. Especially as you can get 1,1/8th rings in 104bcd. I'm currently having to use a BMX ring as it's the only 110bcd ring I could find which didn't have shift ramps.
You think it's not worth getting it made in 7075 and 6082 will be plenty strong enough?