Aster JNR 8550 & Aristocraft live steam Mikado
Clumsy me. One of the fittings for the sight glass was tad loose, and it didn't take much pressure from an errant thumb to rotate the fitting and break the sight glass. I measured ~5.5mm or maybe 7/32" OD depending on the tolerances of these things. ~ 1mm wall thickness. the OD seems to be in between standard glass tube sizes. Found lots of 5 and 6mm OD glass tube. Has anybody replaced one of these on an Aristo Mikado?