"The two electric guitar-type knob removers arrived quick and seem sturdy and work well. A suggestion, in that the tool's "feet" are hard plastic, and to be careful with 5the guitar. My fix is to wrap the bottom feet with a bit of adhesive tape or adhere thin leather to aid the knob removal by protecting the guitar's finish. Also an instruction card with a simple diagram would be a good touch.
Thank you for making the tool, LFT"
Guitar Knob Puller 2 Pack - Must Have Luthier Tool