english_thread(diameter=negative_dia/inch,
threads_per_inch=negative_tpi,
leadin=0, internal=true, test=$test,
length= (l + inch/19) / inch);
english_thread(diameter=negative_dia/inch,
threads_per_inch=negative_tpi,
leadin=0, internal=true, test=$test,
length= (l + inch/19) / inch);