The gauge should be a friction fit - if not adjust the wheels on the axles or replace if necessary. OO Wheel Gauge - Back to Back.
OO Wheel Gauge - Back to Back. 14.4MM
OO Wheel Gauge Back to Back. 14.4MM Golden Valley Hobbies GVB2BOO
66602 Trix Wheel Cleaner OO HO Gauge Conductive Loco Wheel Cleaning Brush
2 Pack - OO Gauge (1:76) Back to Back Wheel Gauge Tool 14.4mm
