Without that fiber washer it will last about 1000, 2000 miles (maybe).
My 1st time the washer had slipped down but not out I did not see it and next spring I had to do the job over.
I used a light application of grease to hold them in place.
Garry1p
1990 Holiday Rambler Aluma Lite XL
454 on P-30 Chassis
1999 Jeep Cherokee sport