I have my timer set up with adjustable stops on the all thread so it has a few inches of free play Going Down and does not slow anything down until the last 1 inch of upward travel when the clutch disc starts to make contact. This is why they have you check the clutch disc to flywheel clearance with a feeler gauge and run a pedal stop of course. You have to have repeatability or else things will get torn up pretty quick when it comes to a stick car.