Stihl 145 degree pole trimmer head repair

Hi Folks This is a strip down and rebuild of a Stihl 145 Degree pole trimmer head. This one is a 700mm head. You can do the same on a 600mm head, or if you are just replacing the blades on either. I forgot to mention there is a gasket under the back cover that needs cleaning also. The modified socket I made by grinding off 2mm (in it's total diameter or 1mm off each side) so it fitted in the hole. I just use it to hold those 2 nuts secure and not when undoing other 8mm bolts because of the reduced socket wall. The cog part number from Stihl is 4243-640-1600 The grease I used was Lithium EP2. Video Segments 00:00 Introduction 00:20 Demonstrating the problem 01:04 Inside the head and how it works 02:03 Disassembling the head section and removing the shaft bolts 05:13 Taking the blades apart and removing the cog and checking input shaft 10:04 Reassembly of head and shaft 26:05 Post assembly test Facebook Page https://www.facebook.com/profile.php?id=100057325905694