Description I-16 (in russian):
http://i16fighter.ru/materials/docs/docs.htm
Technical specification I-16 (Google translator):
to lower a flap, it is necessary to press the handle, the creeping mechanism will depart back and will deduce an edge from gearings with a ratchet. Than at handle rotation, the case 10 rigidly connected with her, will rotate in ball-bearings. Together with the case the cylinder 6 with screw cutting which will force the screw 12 to leave the case will rotate also. Thus the flap to fall.
That is for lowering of flaps the special mechanism with a manual drive and a screw gear with smooth adjustment of a corner of release of flaps has been established.
The desperate request to developers to correct this bug and to return manual regulation of a corner of a deviation of flaps on I-16.