I recently installed new light fixtures in my garage. My OCD mandates perfectly square and parallel placement. In the past it was a chalkline but always messy to clean up on drywall. I picked up this little laser level and it was a breeze, Install the first light and slap the laser on the side and the next one lined up perfectly.

on a friggin flashlight !!
The bike's centerstand doesn't allow the pan to get properly under the drain. One may not discover that there is a problem until finding half the oil is running across the floor
while the other half is making it into the drain pan.

