pcylinder c1 2 5
profile p x 1 y 1 x -1 y -1
trotate p 0 0 0 1 0 0 90
trotate p 0 0 0 0 0 1 90
ttranslate p 0 -2 0.5
explode c1 f
explode p e

featrevol c1 p p 0 0 0.5 0 0 1 0 1
addslide revol p_4 c1_1
featperformval revol result 360


checkprops result -s 100.531