I just emailed a parts order to Crosman and found that the Disco hammer spring part number has changed. It was 2261-009, it is now 2261A009.
Also the piercing pin/disc used on several different Crosman models as well as in the Pro-Top valve conversion has changed. It was 38A027, it is now T4-041. This I had already read somewhere and it was confirmed by Crosman.