Help! We had a stainless steel sink installed as part of a reno. The drain hole is 3 3/8 not 3 1/2. The garbage disposal flange won't fit. We can't send back the sink because it is under a quartz counter top. I've called plumbers, fabricators, blacksmiths...to no avail. It needs to be "shaved" 1/8". Who can I get to do this? what tool should they be using? What questions should I ask before I let somebody touch the sink (to avoid potential damage)? Thanks!
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Stainless steel sink drainhole off by 1/8"