Hi Norm,
Have you ever tried to plastic weld them back together? I haven't looked at a broken one and it would depend on where and how the break etc, but that could save quite a bit.
Hi Converse,
At this point, I believe the issue has been identified (The brass washers need to be put in place), I just need to get the correct parts to troubleshoot further. I changed the decompressor to one that does not have an O-ring on the cap, the one I'm using is pressed on so it shouldn't come loose, and to further test for vacuum leaks when I was troubleshooting I was spraying SYB around the engine and at no point did the revs change, except when spraying it in the throttle/air filter housing.
When you have an air leak, something that you can try doing is spraying starter fluid (Like SYB) around. If all of a sudden you notice the revs drop down, it's because while you were spraying the starter fluid where the air leak is, fuel is being sucked in instead of air through the leak, getting the mix back to where it should be. Try if yourself if you'd like, with your mower running at full revs, spray some starter fluid into the air filter (Not a lot, just to test), and you'll notice the revs will drop down. Just a tip

Cheers guys,
pau13z