Lawwill Leader
Depending on the age, the Leader fork's Risse shock had a needle valve or a schrader valve. A simple air/oil shock-to service it, first let the air out-a mist of oil will come with it. Then unscrew the shock body and clean it out with a clean rag. Fill it with 55cc motorcycle shock oil-5 weight is a good place to start, but you can use heavier oil to slow it down a bit- then reassemble it and pump it up to about 70 pounds of air pressure-which is the spring- and can be varied according to your weight.