The DLE DrilDLE drill guide for the 30, 35RA and 40 engines. It constrains the drill bit so the propeller bolt holes come out evenly spaced on the correct pitch circle.
A propeller has to seat flat and true on its hub, and it only does that if the bolt holes are accurate. A hole drilled off position holds the blade slightly out of plane, which puts a bending load into the hub and lets the bolts work loose — on a propeller, that is a failure path rather than a nuisance. A guide is what makes the holes accurate.
Suits the DLE 30, 35RA and 40. Confirm the pattern matches your engine and hub before drilling.
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