GT55 Prop Washer OS29709000 for RC Aircraft by O.S. Engine  [OS29709000]

Washer for prop retention and balance

This O.S. Engine OS29709000 propeller washer GT55 serves as an RC-scale retention part that locates and secures a propeller on the model aircraft shaft. The washer is a simple mechanical spacer placed between the prop and the securing nut or spinner assembly to ensure repeatable seating and consistent contact across maintenance cycles.

Fitting is simple: remove the prop nut or spinner, slide the washer onto the shaft against the propeller hub, then reinstall and tighten the nut or spinner in your usual way. Confirm shaft flats and prop seating so the washer sits flush and does not introduce any misalignment. No special tools or torque settings are required beyond normal practice.

When tuning or troubleshooting vibrations, keeping a dedicated washer in place helps preserve consistent seating after multiple prop changes, which reduces shifting in balance and narrows down vibration sources more quickly. Include it in routine checks during prop or bearing service.