THE WORLD MODELS PIPER J-3 CUB 26s Instruction Manual page 14

Usage of the transparent 3D template
1
3
Simply cut the transparent 3D template to fit your engine and
exhaust pipe, then slide onto the actual cowling and use as
template to mark the openings required for final cutting.
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This transparent 3D template
is used for position guidance
of the actual cutting of the
pre-painted cowling.
2
4