There is a way to make a simple one if you have some basic tools and maybe a tap to thread holes for water inlets.
You can use a standard o-ring and a piece of aluminum tubing 1/16" thick. There is a standard size of tubing that works perfectly at metal shops.
Just get them to cut it near the right length maybe a tad longer. Sand the edges to make them burr free and smooth. Drill 2 holes the correct size to tap for water inlets and tap.
Put o-rings on motor, add grease or oil to inside of tube and carefully slide on.
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