Bought a $20 set of ER collets once. The 1/4" one was more oval than round.

Blairm35's point about balance is spot on. One time a barista at my local shop remembered I take oat milk in my coffee after she jotted it down once, and that small thing made me a regular. Writing stuff down shows you care, but if you're scribbling while they're talking, you're definitely missing half the story.

A lot of people forget that cheap tools can also damage the part you're working on, not just break themselves. That Harbor Freight puller probably warped the threads on your injector bore before it snapped, making the extraction even harder on the shop. Did they mention if they had to helicoil anything while they were in there?