door closer question

A handy person from Missouri says:
I purchased a 40-079 door closer from Swisco to replace a worn out S-B Manufacturing Storm King Model 105. Installation was easy and thankfully you offer this product as it resembles the design of the old closer. However, I have a problem with just the last few inches of door travel (see attached video), because it stops retarding and then closes with a bang. Turning the adjusting screw all the way in slows the closing but does not alter the final retardation. I realize you'll notice that I haven't installed the last two retaining screws on the jamb, deciding not to drill the holes quite yet if I can't get this one to work. I bought two of these, just in case, as I have another storm door with another original Storm King that still operates. I believe they both are 60+ years old but the one that is still doing its job has had much less frequency of use.
Do you know a solution for my problem?
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Julia from SWISCO responded:

Hello, thank you for writing in. I'm going to have one of our senior experts take a look at this and see if we can resolve your issue. We will be in touch shortly! 

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Julia from SWISCO responded:

Hi there. Thank you for your patience. We have found that correctly locating the storm door bracket is very important. The trick is to use the 40-045, our Storm Door Hold Open Washer, to find the correct location for the bracket. You may not be able to re-use your old hole locations as our 40-079 might be a slightly different length than your original part.  Take a look at the video below, along with the other associated videos, and see if they can assist you in this matter. 

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