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@Sergeant_Pluck
I see that the thin MKS chaintug fits track ends up to 5 mm, according to Hujub. Is that an accurate upper limit? I measure my Bob Jackson's at 5.3 mm ish. The fat ones look a bit more bulky than I'd like.
Not that I like tugs much in any case, but just occasionally my wheel moves fractionally, no matter what I do.