We had V5 motors for 4 weeks and our local teams report about half of the inserts showing various degrees of damage with a few completely unusable. It is not an option to order new motors just because inserts are damaged and spares are not available from VEX.
Luckily, there are commercially available alternatives that are even better than what comes with V5 motors. Here is the manufacturer link: https://www.biscoind.com/LynTronInc/AA6921D-0.437-00
Below is the picture with V5’s 8-32 motor inserts on the left and 6-32 replacements on the right. Leftmost insert is in the good condition and second from left started shredding some threads just after 3 mounts/dismounts. On the right is the commercially available replacement as it is shipped (it is slightly longer than original) and second from right is when it filed to have shorter length and with rounded bottom edges to match the shape of the V5 originals:
And this is comparison of the 8-32 originals vs 6-32 replacements when inserted into c-channel:
