Here are a few other threads with some good examples of this issue.
https://www.****************.com/fo...nance/113025-rim-guard-valve-stems-print.html
Rim Guard and valve stem failure [Archive] - Weekend Freedom Machines Forum | Vintage John Deere Tractors
https://www.tractorbynet.com/forums/parts-repairs/203562-rim-guard-aggrivation-2.html
I wouldn't put any liquid ballast in my tires unless I had metal valve stems.
https://www.****************.com/fo...nance/113025-rim-guard-valve-stems-print.html
Rim Guard and valve stem failure [Archive] - Weekend Freedom Machines Forum | Vintage John Deere Tractors
https://www.tractorbynet.com/forums/parts-repairs/203562-rim-guard-aggrivation-2.html
I wouldn't put any liquid ballast in my tires unless I had metal valve stems.