Intro: Improvised Speed Bag Swivel
start with 3/8 eye bolt sleeve anchor
take out the sleeve and golden nut
drill a 10 mm hole in the middle of the platform
put the bolt through the hole
hold it up with two washer and a nut
put a shackle the speed bag
put the shackle through the eye bolt and you are done!!
maybe not the best option but sure is a good replacement!