Stihl 145 degree pole trimmer gear head fitment repair

Hi Folks.
This is a video about replacing the gear housing on a Stihl pole trimmer head.
Gear housing kit Stihl part number : 4243 - 640 - 0535
Set of mounting hardware Stihl part number : 4243 - 007 - 1300 - A
Lithium EP2 grease used to fill the gear housing
The other 2 bolts are used to clamp down the shaft
Torque setting 5.9lbft (just over the bottom setting on my 80ftlb small torque wrench)
Video sections
00:00 Start
00:02 Introduction to video
00:30 Parts in the gear head kit and assembly of height selector handle part
01:55 Attaching the handle, locking mech band and cog locking pin operation
03:32 Parts in the mounting hardware kit and fitting the first part
05:57 Attaching the gear head
08:37 Torqueing down the attachment bolt, aligning it correctly and final assembly
14:02 Demonstration of the cog locking pin.
14:28 Summary and a thought of what might have caused the damage
Fitting the blades and cog video
• Stihl 145 degree pole ...