Ok, now you’re talking about the contacts. When you buy a new switch (they are cheap) it will have a new contact. The one in the housing is split and has the coil leads soldered into it and you will need to use a small torch to remove them. You need to be very, repeat, very careful so you don't damage the insulation on the coil so you need to heat sink the leads. Then you will need to clean the threads of solder before you can get the nut off and remove the contact.
There is no adjustment on the stroke. If it's not pushing the switch in far enough to make contact after replacing the contacts then chances are the linkage has worn or is bent and needs to be built back up by welding or straightened.
Ken can fix you up with the contact and switch.
[email protected] Denny Graham
Sandwich, IL