A lot of things work just fine as truing jigs.
I've posted this pic before. After about 10-15 years of not building a wheel (previously a few hundred at various LBS's) I decided to build a set, but didn't have a jig at the time. Ten cents worth of zip ties did the job:
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If someone tells you that you have enough bicycles and you don't need any more, stop talking to them. You don't need that kind of negativity in your life.