mornin peeps,

the other day i purchased a detwannging kit from t.robb airguns for my fac falcon (20 ft/ibs). the kit comprises a small brass spring guide to replace the plastic falcon one-fair enough. Now then, there are also 4 x 20mm dia approx white, very thin ptfe discs which the instructions say to use 1 or 2, bend in half and fit in the spring?? to stop it resonating after each shot?? anybody know the correct way to fit these ptfe discs?