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@gbj_tester
You must be very young. Numerous small manufacturers have used that design since the 1990s, and there are still a few today. It has the virtue of almost zero tooling cost, since it can be made by just chopping up tube and rod stock, but other than that it's not very good; peak stress on the saddle rails tends to be high, angular adjustment is minimal and the whole shaft is usually plain guage tubing rather than having the material distributed according to the various stresses.