The handiest thing in the world might be small stainless hose clamps.
They can be used to retain wheels on spindles instead of those "c" clips.
They can be used in emergency to retain balls in worn tie rod ends.
They work on mowing deck lifts to prevent the central deck spindle grease fitting
from rubbing on the deck lift lever and destroying the grease fitting.
Work for me, especially in a jam.
-Tom