How do you fix marksman 1700 series rifle?

Unfortunately this rifle is not worth repairing. In Excellent condition it is worth $18. It has an FPS of 250 FPS. That's slower than a Daisy Red Ryder. I really suggest you purchase a new air rifle. These air guns were not designed to be repaired.

Marksman is owned by Beeman. If you want to try I suggest you call Marksman at 800-822-8005