Normally with a plunger type switch all you have to do is adjust it enough until you are able to read Zero OHMS across the 2 terminals on the switch with the plunger pressed in. To see the terminal just unplug the large electrical connection to the switch and attach the 2 meter leads of an ohmmeter across the 2 terminals. You can then adjust the switch in or out as needed, just make sure the reading is Zero OHMS when adjusting the switch against the pedal. If you go too far out with the plunger you will get an "OPEN" indication on the meter. All we are looking for is when the pedal is in the normal position is the Zero ohms (closed switch) and when the pedal is pressed an open indication. If you have no meter then you can get a continuity test light and do the same. If the plunger still sticks when you are at a minimum adjustment, look to see if it has some "gunk" around the plunger, if so get some electrical cleaner and spray it around the plunger to see if that helps. If not you might need to get another switch. Yes, a bad top switch can cause the cruise not to work. There are other indications we need to know to tackle this, however--- such as do you get the cruise light to come on
Darrell.