They are super simple guns to work on. I have spare bolt handles here if the handle has cracked or any other parts you might need.Remove the stock by the two stock bolts and one trigger guard bolt. Remove the bottom bolt at back of tube and catch the back cap and spring. Remove the breech bolt in the magazine well. Loosen the barrel band screws and slide that forward and off the pressure tube then lift breech and barrel off the gun and turn it over to see if anything has fallen apart inside. Sometimes the bolt that cocks the hammer either on the hammer itself or the one in the pellet probe can come loose. Make sure those are tight. When you put the breech back on push the bolt hamdle all the way forward and lock it down then put on the breech and put the hammer spring in and back cap and screw the back bolt in and then cock the gun before putting the breech screw back in. Otherwise the cocking bolt will end up on the wrong side and you'll not be able to close the bolt again.