Whatchamacallit

I spent some time at work on Thursday troubleshooting a problem on a QA system.
This raises an important question, specifically, what is the correct past tense of “troubleshoot”? “Troubleshot” shows up in the spelling checker, but it just doesn’t sound right. At best, it sounds like a kind of shotgun cartridge (sorta like birdshot). Likewise, “Troubleshooted” (which shows up in the Firefox spelling checker but not Microsoft’s) sounds like it’s both present and past tense at the same time.
According to Merriam Webster, the correct form is troubleshot, which is good to know. This sort of question tends to come up when I go looking for trouble.