The correct way to replace a chuck on a cordless drill.

This is the correct way to replace a chuck on a cordless drill. Dismantle the drill and gearbox to access the spindle, lock the spindle in place so you can lever the old chuck of.
This is the safest and correct way to do it. But it is also the slowest and most risky for a beginner.
It is very easy to get lost rebuilding the gearbox or lose parts.
It also means you need a special tool to lock the spindle, and each brand uses a different spindle. So a different locking tool for each.
The hammer and Allen key is my go-to method, followed by cutting it off with a grinder.
But these options can not always be used, especially if you want to keep it the old chuck.
In which case, this is your only option with some modern tools.
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