This is an indstry of tricks.

Bicycle mechanics work in an industry of tricks. Every little trick saves time and every little bit of time adds up to more services done. This is important in the shop or at a race.

This is a little trick I came up with for the Park BBT-10. 

You start by grinding both sides down evenly until the tool is 2mm wide.

Then you grind the top edge until it is square.

You still use the tool in the same way. But when you would normaly reach for a flat head screwdriver, you just turn the tool on its side and use it to flip up the plastick retention tab.

And voila! Just a little trick that saves you one step.