You need to change the oil on your mower and you can’t remember the filter number to buy?
I have a solution. I use a paint pen that you can find in the the craft section to label the end of the filter with the filter number and date changed. The new filter has an arrow to tell you the direction to turn to put the filter on. However that arrow usually isn’t visible when you go to take it off. I also paint an arrow to indicate the off direction also.
On my John Deere 3032E, I got tired of crawling under it trying out sockets to fit the oil plug. I took the pen and wrote the size and direction to turn the wrech.
Check out my GRIT magazine blog post.