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That part looks like nylon . . . a material that would have appropriate properties for the intended purpose. Not-so-common knowledge about nylon is that it is hygroscopic, meaning it absorbs water. In the 1970's, before exotic materials were commonly available, I used nylon propellers on model aircraft. I'd turn a 6" diameter prop at 30,000 to 35,000 rpm on my racers. That rpm equates to a tip speed of 900 feet per second or about Mach 0.80. The nylon prop was at risk of exploding from the centripetal force unless it was first boiled in water for about 15 minutes. In between flights I'd store the prop in a moist rag to keep the water content up. Adding water to the nylon made it stronger and more flexible and able to withstand the forces of such high rpm.
So immersing your nylon part in hot water (if it is nylon) will soften it with heat. If you boil it for about 15 minutes, you will also add moisture to the nylon and make it stronger, more flexible and less likely to break when you stretch the socket over the metal ball.
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