Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to use a bench grinder [title] Perform a safety check before turning the grinder on. [substeps] Make sure the grinder is tightly secured to the bench. Check that the tool rest is in place on the grinder.

Ending1: Make sure the tool rest is complete before beginning the drive-thru. [title] Enable the drive-thru to start, then perform a safety check. Ending2: Remove the grinding nut to verify that it is secure. [title] Install the brush attachment to the grinder. Ending3: The tool rest is where the metal item will rest as you grind it. The rest should be secured in place so there is a 1/8 inch (3 mm) space between it and the grinding wheel. Ending4: Make sure to turn off the grinder or it may shut off once the bench grinder is turned on. Tighten the time on the bench to " depress " the grinder.

Answer format: ending1/ending2/ending3/ending4