Quest Planet Probe #Q1022, Part 4, The Launch Lug Slot

Launch Lug shrouds slots are always hard to cut out. Good luck trying to cut the tight circle with a hobby knife or scissors.

TIP: Punch out the small circle first with a rotary punch. Then joint up the the straight sides with a knife and straightedge.

Above - right side picture:

While testing the fit of the lug, round out (and enlarge if needed) the punched circle with a sharpened dowel.

Leave any overhanging lip on the underside of the shroud. That little edge will give you a a bit more support and wider gluing area.

Cut out the outside edge of the shroud with scissors. 

Run a fingertip around the cut edge and you'll feel some highs and lows in the cut.

TIP: Run a piece of 400 grit around the edge. This will take down any inconsistency in the curve.