[Fathand]

Originally Posted by jacot23

I use a Adjustable Guitar Nut & Bridge Sander Luthier Tool I got on Amazon

https://a.co/d/fBT2c66

I got one of those from aliexpress but I find it quicker to double stick tape the saddle to a piece of scrap wood and put on the belt sander. Somestimes I just hold the saddle on the sander.
Of course mark the work first so you know how far to go.