Please see the link to the product brochure here:
Download File
Your question was regarding the control over the latching and closing speed and indeed you can see that defined in the link to the product catalog above.
I would start by carefully removing the slotted screw cover that would be closest to the door as seen in your photographs here:
View Image
Is there a follow up question that we can perhaps attempt to answer? We take deep pride in our technical expertise (something Amazon can not provide) as we know it separates us from our competition, so don't hesitate to ask.
Please reply to this email or contact our sales department here:
Click Here
if we can assist you by answering further questions or with entering this order and please let us know if there is anything else we can help with. If this answer was helpful -
please consider following us on Twitter
or liking our page on Facebook
Thank you for your consideration.