Anyway, if you feel like you're hitting something, inspect the cushion ring (black rubber ring) on the actuator (white plastic round piece near the bottom of the controller). It may have slipped out of position. Most often these just melt away over the years and turn into goo. There's a pinball rubber you can get that is a good replacement if you need a new one.
When I fixed mine (I didn't do a rebuild, I was just replacing the cushion ring) I used the flipper rubber from a Space Shuttle (I had a set of rings for it that I hadn't used yet). Looking at one of the rings, it says '1 1/2" x 5/32" x 1/2"' on the side.
Note that I only replaced the ring on the one stick, and I REALLY need to get in and do the other one. The difference isn't large, but since the other ring is quite old now, I can feel the difference quite a lot. So even if you don't do a full rebuild (when I got my Assault I REALLY wanted to play it fast!), if you swap one ring, do both.


