Seems that there might be a market for these adapters at a reasonable price.
Strong pipe to fit over the ram and round stock for the different sized adapters seems the least expensive for many reasons.
There are plenty of sources of strong materials from scrap items for the round stock as the pins don't need to be very long.
For fitting & welding the different sized "pins" to the pipe collar. A person could do that a few different ways to fill the space between the parts before welding.
Some cutting, grinding, welding. Drill a few holes and tap, or weld nuts on for bolts to hold the adapter to the ram. Clean it up and give it a shot of pant and $ELL them at a reasonable profit.
Machining from larger bar stock would be far more expensive, BUT if a person already has the metal lathe and cutters and can get the bar stock at a reasonable value. They could see if it was cost effective to manufacture when the prices of other such adapters for sale are factored in. A person could still use pipe for the ram collar and then use smaller bar stock that fits the pipe tightly and machine the different sizes.
Just some ideas for a possible adventure for someone that has the tools and experience and is looking for something that they can make that may sell well enough to make it a good biz depending on demand.
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