Make a custom wrench to fit small oil filters.
Step 1: Custom Oil Filter Wrench
I could not find a oil filter wrench that would fit my mowers oil filter. I decided to make an adapter for my oil wrench. I had just replaced the mower deck belt so I decided to use the old belt. I measured around the oil filter and cut the belt to the measurement. I wrapped the cut belt around the filter and placed the oil wrench over the belt. This was a perfect fit. I easily removed the oil filter.