Great Planes Matt Chapman Eagle 580 ARF 1/3 Scale - GPMA1286 - Manual (Page 21)

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o 3 . Slide the cowl over the engine onto the fuselage . On
the DA-100 you need to remove one of the two spark plug
boots to get the cowl on .
o 4 . Cut a cooling slot at the bottom of the cowl that matches
the air exit slot in the fuse .
o 5 . Fit the spinner backplate and position the cowl 1/8"
[3 .2mm] behind the spinner backplate . Center the cowl with
the backplate and tape it in position .
o 6 . Align a ruler with the lines you made and measure 5"
[127mm] forward to the cowl . Mark the cowl for each blind
nut . Remove the cowl .
o 7 . Drill a 1/8" [3 .2mm] hole at each mark and reinstall the
cowl using six 4-40 x 1/2" [12 .7mm] SHCS, six #4 lockwashers,
and six flat washers . Don’t forget to use threadlocker .
o 8 . Install the spinner and a balanced prop .