Having a well stocked junk hoard has saved my bacon on quite a few occasions----notably when having to replace a porcelain insulating standoff from the PA grid circuit of a "Nera" FM Broadcast transmitter.
The manufacturer was on the "other side of the world" & semi-defunct, so it was wait & hope for months, or try to find something.
In a box of National HRO parts at home, I found two standoffs which were just about the right size, & could be pressed into service--"one for now", & one for a spare.
Just as well I provided a spare, as years later, that insulator failed too, & needed replacement.(the circuit layout was a very poor design).
I hadn't possessed a National HRO for over a decade at the time, so had contemplated giving the bits away!