Ruger MK III .22 pistol total disassembly

Ok, here's the deal. Had an issue with the trigger return on my MK III .22 pistol. Went to the 'net for answers and everyone said "install the hammer bushing".
So, I disassemble the pistol as instructed. Opps, the roll pin that secures the hammer goes out too far and all sorts of small parts spit out on the gun mat. I can account for everything but a small detent. This detent is very small and has a straight shaft with a small mushroom head. I have NO IDEA where this small part goes.
Anyone one have a clue ?

I haven't had mine completely apart in at least 6 years so don't remember. However I found this on the web. You can take a look at the schematic here and see if you recognize it. Need Adobe Reader to view.

http://locationsnapshots.ca/rgm/h-mk_3-xv.pdf

Here is a link to the total disassembly of a Mk III

http://www.guntalk-online.com/fsprocedures.htm
http://www.guntalk-online.com/detailstrip.htm

Good links Bud.

sounds like the safety detent