My gym buddy lost 40 pounds when he started logging workouts with a partner instead of alone, same idea as your 78% stat. People follow through more when someone's waiting on them, whether it's lifting or writing chapters.

Battery dying mid-scope is the worst, been there. Get yourself a cheap USB power bank and a longer cable so you can run it off that while you work, the little internal cells on those things are junk after a year. Also pull the battery out when it's going to sit for months, they leak and it kills the whole unit. Mine lives in my go bag now and I use it maybe once a month on gearbox and wing checks, mostly for looking into tight spots I can't get my head into. Truth is for a lot of jobs the mirror and light still work fine, so yours isn't wasted, it's just a once in a while tool. Bring it out when you actually can't see, not for every job, and it'll feel worth the money again.

Ovens dont need leveling checks, thats for dudes doing flattops.