This RC-scale rocker support is produced for the O.S. Engine FS-120S and is listed under part number OS45561410. It acts as a service replacement to stabilise rocker alignment, reduce end play, and maintain correct valve actuation geometry during routine maintenance and setup.
Fitting the part is a standard maintenance job: remove the engine cover or any mounting hardware, replace the worn support with the OS45561410 service item, then reassemble while checking clearances and rocker movement. Work carefully at this scale, confirm free movement before final assembly, and consult any engine-specific service guidance you have to hand.
When used as part of tuning and setup, the support helps preserve repeatable valve geometry and can reduce inconsistent valve timing caused by worn rocker seating. Include it when addressing ticking, excessive end play, or when making precision adjustments after break-in or repair.
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