DLE 30 - Manual (Page 9)

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8. Cut all necessary clearance, carburetor adjustment, cooling, and
exhaust holes in the cowl.
9. Make sure the cowl is secured to the airplane and that the spinner
back plate to cowl clearance is at least 1/8” [3.2mm].
Drill and Install the Propeller
The easiest way to drill the propeller to fi t the hub is to use a drill guide.
If you do not have a drill guide, you can use the following method to
drill your propeller. Most propellers within the recommended size
range have a 0.393" [10mm] center hole pre-drilled. If your propeller
has this predrilled hole, move on to step 3. If not, start with step 1.
1. Remove the cowling from the aircraft. Use the included propeller
washer to mark the centering hole on the propeller
2. Once the location is established, use a drill press with a 13/32
(.406/10.31mm) drill bit. In order to achieve a clean hole opening on
both sides of the propeller, drill only half way through the propeller
with the 13/32 (.406/10.31mm) drill bit. Then fl ip the propeller over
and drill completely through the hole.
3. Next, set the engine at the top of the compression stroke. Note
the position of the ignition magnet with engine inverted.