i recently had the screwbell ring on my ambronze lawson rotated because the area of right hand placement in the bell has become quite pitted. while i know that some people's personal chemistry can cause this, my lawson is only 7 yrs. old, and i also have owned a yellow brass (fixed bell) conn 28d for 34 yrs., with no pitting whatsoever. i have researched the alloys involved. the lawson, as i recall, is 84% copper, 14% zinc, and 2% tin. the conn is 70% copper and 30% zinc. could it be the tin that is leeching out? are there any other lawson owners out there who have experienced this problem?
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