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This steam dome has been designed from a plan of the NSWGR C32 steam dome and is available as a replacement for the steam dome on the Ixion HO NSWGR C32 Class steam locomotive.
It has been designed to fit in the same hole in the boiler; the flange at the base is the correct size and won't fit into the larger hole of the two holes. The flange is only 1/3rd of a mm thick on the edge. This is as thin as the printing process for Frosted Ultra Detail and Frosted Extreme Detail allows.
The plug underneath the steam dome will fit into the inner hole in the C32 boiler.
The Ixion steam dome can be removed relatively easily from the boiler, just pull on it with your fingers.