#K6----------------------------------------------
beziercurve cb 4  2 0 0  20 10 0  20 20 0  2 30 0 
polyline pl 2 30 0  2 0 0
mkedge ed cb
wire ww ed pl
mkplane ww ww
revol rv ww 0 0 0 0 1 0 -180
profile pf o 2 15 10 p 0 -1 0 1 0 0 l 3 t 0 15 \
t -3 0  
revol pr pf 0 15 10 0 0 1 300
bfuse f rv pr
nexplode f f
depouille result f 0 0 1 f_6 1 0 0 25 0 0 1

checkprops result -s 2498.26