GREAT PLANES Ryan STA-M Instruction Manual page 23

7. Use 30-minute epoxy to glue the cowl mount blocks
into position.
8. After the epoxy has hardened, place the cowl on the fuse.
Place the back plate of the spinner on the engine. If necessary,
have an assistant hold the cowl in position. Use a felt-tip pen
to mark the center of the cowl mount blocks on the cowl.
9. Remove the cowl from the fuselage. Use 30-minute
epoxy to glue the four 1/32" [.8mm] plywood discs to the
inside of the cowl centered on the marks.
10. Reposition the cowl on the fuse. Place the back plate
of the spinner on the engine. Be certain to allow adequate
clearance between the spinner and the cowl–3/32" to 1/8" [2
to 3mm] is suitable. Holding the cowl in position, drill 3/32"
[2.4mm] holes through the cowl and the center of the cowl
mount blocks. Remove the cowl. Enlarge the holes in the
cowl with a 1/8" [3.2mm] drill.
11. Run the screws in and out of the cowl mount blocks
several times to "cut" threads into the blocks. Add a few
drops of thin CA to the holes to harden the "threads." Be
certain the CA has fully hardened, then mount the cowl to
the fuse with four #4 x 5/8" [16mm] screws, #4 lock washers
and flat washers. Mount the spinner to see how it all fits.
12. If using a fuel filler valve, make a mount from 1/8"
[3mm] plywood (not included). Glue the mount into position.
For cowl installation, it is easiest to position the fuel filler
valve aft of the cowl ring. Also mount a remote glow plug
hookup if using one.
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