Ratrig originaly designed the Y ADXL mount to use an ADXL345 with 16 mm hole spacing.
I have the GY-291 version with only 15mm hole spacing.
https://arduino-projekte.info/produkt/gy-291-adxl345-3-achsen-gyroskop-beschleunigungssensor/
So I desgined this adapter.
Used Standard M3 heat inserts with 4mm diameter und 5,7mm length.
washer can added in counter bore.
original M3x25 screws can be used. To mount GY-291 you need M3x6 cap head screws.
The author marked this model as their own original creation.