Crosman 2240-2250 Safety Spring+ Ball+ moly grease, These are very small and easily lost.

The easiest way to fit is to remove the front and rear screw that hold the trigger housing, then remove the housing. Place some grease on the spring and ball and the small hole where the safety spring and ball go before you place the ball and spring in the hole. Putting a little grease on the spring and ball makes it easier to keep control,  you can then place the housing back

Post and packing is getting very expensive so you can add another for only £2.98 under the options tab below.