10-07-2020, 01:31 PM
If the valve stem had dropped into the well the only way to retrieve it is to lever off the tyre bead to get your hand in. Get your knee on the tyre 180° from the valve and push the bead right into the well then get a tyre lever and prise the bead over the rim near the valve. Work about 6" or so off so you can get your hand in and work the valve stem back through the rim, and then make sure you hang on to it when you work the bead back over. Some metal dust caps have an adaptor for valve removal, but normally there should be a thin nut to screw on to the valve to locate it on the rim and to stop it going back through the hole. You'll need at least 1/2" of thread avalable to get an air line onto it to reinflate - good luck.