how to dismantle light meter Gossen Sixtry?

My Gossen Sixtry light meter did not work for a while. I tried to
dismantle it but got stuck soon. It was easy to unscrew 4 screws on both
sides. But I have no clue how to open the case and no good luck after
searching on internet. Finally, I found 4 screws under white dots at
corners. That solves the problem.

今天終於打開測光表, 修好了。

測光表居然壞了GOSSEN SIXTRY

昨天拿出久沒拍照的ZORKI-4, 順便拿出了GOSSEN測光表, 沒想到指針居然一動也
不動........

靜極思動 ZORKI-4

今天清點了設備, 發現ZORKI-4好久沒拍了。試了快門和機件動作, 一切正常﹗或
許該出動了......