Heavy bag install in apartment door

I need to install a heavy bag in my door jam. Thinking of the gravity boot system. If good enough for 90 kg man, should be good for 5kg bag. (Bag stuffed with old laundry)

I’m having trouble just finding the clamp. Any ideas? Google is failing me.

Btw - this is for therapy for my eight year old son, who has bad ptsd.

pull up bar

submitted by /u/negativemtc
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from DIY https://ift.tt/2QzCcTO