As an example I broke two springs on one night.
I had the spring for the primer shuttle fly off into oblivion not be seen again while changing out the shuttle.
A quick trip down the block to Harbor Freight solved the problem. For a few bucks, a plastic tray with many different sizes, shapes of springs.
Pulled out one that was "close enough"...and it got the job done.
Worthwhile having the "right" spare parts like that long as they don't gouge you five bucks a spring..but I have trays like that of not just springs, but roll pins, nuts and bolts, clamps, cotter pins, "o" rings, washers....
They cost only a few bucks each, and have saved my azz on more than that occasion.