Synchronizing the governor and carb like I described is a simple job, and it can't hurt to do it while you're working right there anyway. May or may not fix your problem, but it is the one spot in that whole lever-to-governor-to- throttle plate connection that would keep an otherwise good governor from doing it's job.
To answer the other part of your question, springs and thrust washers for the governor are easily had, and a governor rebuild can be a nice little project, too. Things like weights or the pins they hinge on take a little more scrounging, but they're out there, too, both as salvage and NOS.
BUT, there's a lot of other things that could cause your motor to falter the way you describe. A lot of those things are really simple (obstructed fuel flow would be a good example). These aren't rockets, so even a more intimidating project like tearing down, cleaning and rebuilding a gummed up carb can be done if one has a clean spot on the bench (better yet, the kitchen counter!), a few tools, and the ability to follow directions.
If you've got the linkage adjusted up right, and the motor speeds up and slows back down as you operate the lever back at the seat, I'd say the problem likely isn't in your governor. In fact, it sounds like your governor is working as it should, since it's demanding more fuel for the load, and just isn't getting it. Common causes might be classed as not enough fuel or too much air, either of which has pretty much the same effect, too lean a mixture to pull a load. Obstructions in the fuel line or a dirty carb can do it. A vacuum leak really shows up because a) you pull in straight air above the carb which radically leans out the mixture, which is lean already because, b) the loss of vacuum pulls less fuel through the carb in the first place. There might also be issues of ignition timing or valve clearances.
You need to go through and make sure all those things are squared away before you go tearing into the governor.
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