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Blowing-down sight glass

Fizz Member Posts: 547
WM-SGO3, from 80's, with dirty sight glass half-way. Want to loosen petcock to blow-down, but not sure what to loosen. There's a nut similar to my 2000 SGo-6, on bottom of assembly, but also a detailed-like attachment on nut-do I turn nut, or other attachment?