Times are tough, and bicycles are a mode of transportation that requires no fossil fuels. Upkeep and repair of a yard sale gem may bring you to this article
Flip the bike upside down, balancing on the handlebars and seat. Loosen nuts on the axle on the forks. Beneath the nuts may be retaining washers that protrude into the forks.
Align the valve stem through the drilled hole of the rim. Press the extruded tire all the way around the rim up until you must employ the flat blade once again to slide along the rim until the outer tire is on the rim.
Loosely tighten the nuts, enough for a new 'wobble' test.