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[patriotscreen]

Never bothered knocking in a GM and never had any damage with them. All others I have knocked in. Playing against a bowling machine is unlikely to damage a bat but I would still knock in the edges and toe like others say, maybe for 30 mins then face a few balls and see how it looks.

[crictech]

always best to knock in first. there are different types of bowling machine balls, some much harder than others