BVM Grumman F-9F Cougar Construction And Operating Manual page 14

 Mark and trim the rails at a distance of .3" as
shown.
This sample accommodates a Jet Cat P-100RX.
Note: When installing a King Tech K-100G Mark
and trim the rails at a distance of .4".
 Reinstall the rails and the tail pipe. The
smoke tube will be reinstalled after the
engine is mounted.
 With the engine set at the appropriate
distance and centered within the tail pipe,
mark the (4) mounting holes.
JetCat P-100RX distance from bellmouth = 7/8"
KingTech K-100G distance = 7/8"-1"
 Use a 6" long 1/16" drill to make the (4)
holes for the #6 Truss Head wood screws.
BVM ®2015 14 Printed 7/3/2019