Playing silly games, with nuts'n'bolts, around an open engine, has you looking at a split of cases, if one of the former is drawn by gravity or by foolhearthedness, into the innards of the vital reciprocating organs...
But, one shouldn't scram any hope, any soon, of recovering the lousy bugger.
All it takes is: one of those extensible pen sized magnet, a broken speedo cable an some superglue;
break the tip of he magnet, leaving 1,5mm of tube (which will be of a very small diameter there) and another 1,5mm off one of the sliding sections, which is a thight fit to the squared end of the speedo cable.
Glue the three sections together and pronto a winding magnet able to reach the most recessed of cavities, wih regal aplomb if not a certain dose of skulduggery...!!
You'll find that a little tape, around the sides of the magnet, helps it not impinging the tip on any solid metal part but the missing hardware.
Now, for the second part of the trickery, something which cannot be missing in any self styled, homegrown, motorhead toolbox: a pair of piston rings compressors.
For this one, we make use of the leafy springs found inside the hand-cranked-winces used to draw in-house rolling shutters.
You wanna end up, with something like this:
...a bit fiddly if one was to do piston rings every other day, pretty useable otherwise, and mostly, them works
Keep on wrenching in the free world!!