I got to the keyboard without screws, BTC-5140, as already mentioned in the title, maybe you or your friends have a keyboard of the BTC-51xx series and they could measure the sizes of the screws … Thank you in advance and once again apologize for my English.
I have not tried to contact BTC, since the keyboard has been around for about 10 years. keyboard Behavior Tech Computer Corp. (BTC) 5140, you can read more here deskthority . net/wiki/BTC_51_series