Before to Replace and Head Gear in Red KaVo 25 LP / LPA you need to disassemble it. This can’t be done without special instrument designed just for this handpices. you need 2 Keys: Ejector and Wrench
▶ Place the ejector on a level support and hold the pushbutton ⑧ with your thumb and press it off.
▶ Remove the conical spring ▶ Unscrew the cover ⑥ in a counterclockwise direction using the wrench, the universal bit holder and the torque handle. ▶ Pull the head casing ① and the adapter ⑪ forward and out and remove the two balls ⑨. ▶ Use the circlip pliers to twist the adapter ⑪ slightly and remove it from the head casing ①, then remove the two springs ⑩. ▶ Slide the spray insert ③ out of the head casing ①. ▶ Remove the drive axle ⑤ and spring washer ④ from the spray insert ③. ▶ Remove two O-rings ②.
▶ Take hold of the elbow sleeve ① with the circlip pliers and turn the wrench, universal bit holder and torque handle anticlockwise to unscrew the threaded ring ⑤. ▶ Slide the adapter sleeve into the insert ④ and push the spring pin into place. ▶ Pull the insert ④ out of the elbow sleeve ① and remove the adapter sleeve. ▶ Push the bearing cartridge ② and axle ③ right back and out. ▶ Remove the axle ③ from the bearing insert ②.