#BB Burner Opens Brass Part Iron O.L & L Company Hamilton 7/8" Thread 1980's. It opens. Will hold a 1 3/4" chimney and 7/8" thread. 1" place for a wick. 1 3/4" tall. We have a lot of lamp parts antique vintage up for sale this week in separate auctions. We have marked them all with letters so that we can identify the correct one. Shelf WS.