I've been bother for some time about how the robot arm is mounted on the ROV. The waterproof servos I'm using a slightly larger than their non-waterproof cousins - only a millimeter perhaps - but enough that none of the standard mounting brackets I have will work. I had originally mounted the arm using some less than ideal pieces of metalwork which were definitely strained in ways that didn't make them or me happy. I wanted to do something better.

Then there other day it struck me what I could simply laser cut a new acrylic mounting bracket - just the same as the one which didn't quite fit - but make it slightly larger so the servo would fit correctly.

In the photo, the bracket on the left is the original, while the acrylic bracket on the right is the laser cut alternative. The hole in the center for the servo is slightly longer and wider, but it's otherwise the same. This means I can finally mount the robot arm servo to the ROV frame "properly".