here I offer you a tool to which is simply attached by means of a clamping on a 2nd toolbar. suitable for toolbars up to 12mm diameter.
The laser image has a diameter of 20mm and accommodates all common lasers of 10-20mm diameter.
Whether wired or with batteries, anything is possible.
Just throw a laser line on the stone and you have a perfect guide to always grind curved knives cleanly on a line.
The illustrated lasers are not included in the scope of delivery and are for illustrative purposes only.