How do I replace a clipper's blade drive?
Most clipper manufacturers make it very easy to change the blade drive. Some even include a spare blade drive free with your clippers for the first change (check the box your clippers came in).
For most clippers, you can replace the blade drive quite easily at home, or it can be done for you by a clipper repair and servicing company.
Check your clipper's instruction manual for the 'how to' instructions, or look up your model of clipper on YouTube for a tutorial.
If in doubt, get a professional to do it for you.