Great idea, I have a fatty piston stuffer.
What is a "fatty piston stuffer" ..... Got a picture of that?
Brussel's sprouts steamed then gently pan fried in some butter ...... Yea! Man. Sometimes they sell them here where they are still on the stalk wrapped all around it. You get about a 1-1/2' stalk and it is just covered with the Brussels sprouts.
If I may (and it's an educated guess); your device consists of a pc of 2" SCH40 pvc pipe (9-12 inches in length)?
A 1/2" SCH80 pvc nipple 8-10 inch in length. The larger end is a 1-1/2" cap (which fits perfectly in the 2" pipe). Why did you double bush it?
You likely ground down the points on the bushing to get it to fit. The small end (the end for pushing) looks to be a 1" cap with a 1x1/2 spigotxthread bushing.
It looks to be a pretty straight forward design, and should cost 10-15 bucks maybe, at a local box store.
Nice tool for cheap.
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2" SCH40 pvc 10" in length , 1/2" SCH80 12" in length, The large end is 2" OD cap which fits perfectly in the 2" ID pipe, i double bushed it to upsize to the correct size, nothing was ground down, the small pusher end is 1 1/2"