Spinning Rivnut / Fuel Sender Unit

[bahf]

I'm not sure if the following technique is well known to fellow seveners.

I came across a spinning rivnut "securing" the fuel sender in the tank and was worried that this could be a problem if the rivnut spun when I next came to remove the sender. To avoid this issue in the future I fixed a 20mm long M5 grub screw into the rivnut (after making sure that the rivnuts were re-secured) and then used a standard M5 nut to secure the fuel sender in place. When I next come to remove the fuel sender I it's a simple spanner and hexagon key with no risk of spinning the rivnut. I guess the same solution can be used for wings, etc.