Made in the USA hard anodized 7075 custom breakin adapter , this allows you to run standard airplane props as well as gives you enough clearance to run standard air filters .... Being able to use standard props allows you to fine tune the breakin RPM of the engine.. My tuned propeller will hold most engines around 17 000 RPM at full power, ideal for breakin !!! This is the exact system I use every day in my shop
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