Canon EF 17-40mm f/4 L USM lens clean the USM motor focus sensor strip bar - repair focusing problem

This video is about disassembling the USM motor, cleaning the focus strip, then assembling the USM motor of a Canon EF 17-40mm f/4 L USM lens. The lens was hunting during focusing, and this was caused by a dirty focus strip. So I had to disassemble the USM motor, clean the focus strip then assemble the motor. To view how to remove the USM motor from the lens, see the "related videos" section below.

UPDATES: n/a

TIMESTAMPS:
00:00 Intro
00:55 Tools
01:14 Like, sub, donate
01:43 Disassembly
03:47 Clean
06:15 Assembly
08:20 Outro

RELATED VIDEOS:
Canon lens repair (playlist):    • Canon lens repair  
Canon EF 17-40mm f/4L USM - how to clean the lens inside:    • Canon EF 17-40mm f/4L USM - how to clean t...  
Canon EF 17-40mm f/4 L USM lens disassembly:    • Canon EF 17-40mm f/4 L USM lens disassembly  
Canon EF 17-40mm f/4 L USM lens assembly:    • Canon EF 17-40mm f/4 L USM lens assembly  

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TOOLS I USED (ebay / aliexpress link):
PH000 screwdriver: http://ebay.us/Dz8nTA | https://ali.ski/2e8ZaZ
Air blower: http://ebay.us/XPC6wo | https://ali.ski/-Yc1r2
Lens cleaning fluid: http://ebay.us/WXS3GC | https://ali.ski/MYvYl
Microfiber cloth: http://ebay.us/YpEifd | https://ali.ski/6CzC7
Small brush: http://ebay.us/R54Rjh | https://ali.ski/LEV6Sk