Hi, New member here, I first came across this forum when searching the net for advice on independent suspension units, I wanted to build a couple of swivel axel units like these ,https://axlesandmorebyjoellc.com/how-to-buy-axles-2-2/ I bought Indespemsion units and then cut them , mounted the axle in the centre and then re assembled by using a cone and a press to push the shaft and rubbers back in the housing, I used silicon spray as a lubricant. If anyones interested I will post some pics as I'm just making a heavier pair.