New sprockets every other chain, and when you clean and lube the chain, check the sprocket for wear. You’re there anyway.

Should be cleaning/lubricating the chain about every 500mi/800km anyway, and if you check the sprocket when you’re cleaning it, you’ll have plenty of advanced warning.

Glad you didn’t have to go far and that nothing important (including you) was damaged!

I literally learned to solder so that I could replace some cheap popped capacitors on a speaker preamp this week.

Worked like a charm.