Increasing tension on 40-189

A home owner from azusa, ca says:
Hi, how much can I adjust the tension so the door closes fast I dont mind the slamming. I tried turning another hole but it felt a little tight already.
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Dave Sr. from SWISCO responded:
Hmm... I know there is a pretty respectable amount of adjustment in the 40-189. I have used the 40-189 in the past and was happy with the results. You said you turned it into another hole to adjust it. Maybe there is only just so much you can adjust. Due to safety concerns, the 40-189 isn't meant to close doors so fast that they would slam.
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