I replaced the handle on my EVSE because the trigger broke. I would not classify replacing the handle as an easy DIY job. I ended up leaving the pins from the old connection because I did not have a crimper to properly re-crimp the pins and in the case of the Mustart I think the Pins are part of the problem. A handle costs about $100 and about 1 hour worth of time. If I was doing it over again I would have just bought a new EVSE rather than just replacing the handle. Or I would have fixed the one I had.Just replace the parts that are bad. You don't need a whole new EVSE, just the J1772 handle. One with good quality pin grip.
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I already replaced the handle on my Mustart 32A EVSE for this exact problem- excessive heat on the pins in the charge port.