10 seconds after trying this I was wondering why I didn't buy it a long time ago. The original cutter head cut many, many rounds, but eventually became so dull that it ground the edge instead of cutting it. I've tried sharpening it - and I usually sharpen tools quite well - but it didn't help. I would advise anyone with a Lyman trimmer to forget about the cheaper replacement head and buy this one. It really should be the one that comes with the tool. I've read some other reviews that said they had issues with uneven blades, but that's not the case with what I got - it worked great.
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