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these are cheap and available in 45/65/85mm stem lengths (actually available, not just placeholders in listings). the length refers to just the black plastic part of the stem so 45mm is about equivalent to 48mm in terms of how butyl tubes are usually measured, so it can be used comfortably with at least 32mm deep rims with most pumps. i reinforced the point where the stem attaches to the tube with charcoal powder (from charred willow sticks, the type used for art drawings) and cyanoacrylate glue because an anon mentioned that he had a leak so he pulled off the stem and glued it back on with gorilla brand super glue.
