Tool suggestion for motor end shafts?

[Rslaback]

I find myself every now and then trying to hold the end of a motor shaft from spinning as I try to turn off a threaded pulley or impeller. Even my biggest screwdriver slips off half of them and makes a mess. It seems like there should be a commercial tool available for this, something like a 9/16" wide by 3/32" thick flat screwdriver socket, to engage with that slot and maybe even allow me drive it with a 3/8 impact gun but I have never heard or seen one.

Has anyone had better luck than me?

 

[WorthFlorida]

Just using an impact wrench will spin the nut and very little on the shaft. Pool pumps is just an impeller, I've done a few just using my hand around the impeller and yes a screw driver or so to hold the shaft.

 

[Sponsor]

 

[Rslaback]

On something like a Red Lion jet pump there is no nut. The impeller has a captured brass insert molded into the back of the resin impeller.