The grinding down was mentioned in the early days of the in-line stat story. Maybe that one was a slighly larger size than others and required it. Doing so risks weakening the structure around the base if the spring housing. However, many R5 pattern stats will fit the hose with a little encouragement, typically heat and lube (!?). Anyway, the stats recommended for the job all fit out of the box.
Recommended: FirstLine, Mahler, Gates (all 88 or 89C rated)
TC
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