Thanks. You folks did a great job. It help me replacing the main dial in 3 hours in just the first attempt.
the 6mm phillips #00 is under the grip. The other 2 are 3mm.
Scott is right. To raise the lever is necessary when putting the ribbon back.
the screw on the grip is 4mm shorter then 2 on the right side.
Screw types were wrong. There is only one coarse-tread Philips on the botton. The top two are fin-thread.