You cannot use/install a bumper in the 4210T high security closer. Also, there is no ST for adding a bumper to a 4210T track, as it's internal profile will not accept the bumper stop, plus if it could, the set screws for installing the bumper stop will not be torx and would make it a non security closer. If you need a bumper and the closer doesn't need to be a true complete security closer you could just do a 4110T closer with a Bumper track and order with Metal cover and torx screws.
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