My home inspection of Speedmaster heads

12many said

Just to be clear we're talking about the end of the spring and slag, flash or burrs Its been mentioned elsewhere that the way the spring is cut/produced is the cause, they weren't cleaned/finished properly. I've seen springs that break because they were junk quality (um, yeah don't say it I've read it all!) never for what amounts to de-burring.That for me would be a see it to believe it.......again as relates to de-burring the cut. I'd be more concerned leaving the spring as is with the retainer pushing that end out.

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You can de burr them, but the only thing I use to do that is a Cratex grinding stone, and a very fine grit at that. 320 would be as coarse as I'd go.

The other thing I wanted to mention is the retainer SHOULD snap into the spring. You shouldn't need to beat the retainer into the spring with a hammer, but it should require a good snap to get it on the spring.

If not, the spring will move all around on the retainer and it makes little chips come off the retainer. It also allows the top of the spring to have issues with hysterisis (not sure I spelled that correctly) and once that starts, the spring effectively looses its ability to control the valve earlier than it should. Also, the retainer, if it fits correctly, I'll change the resonance frequency of the spring. Just like a loose fitting retainer will do. I've seen some wild stuff go on with springs if they ain't happy.