At first I was thinking about making a hole in the steel plate but it was surprisingly cheap so it is better to buy it if you think about time and time. Of course, we can not copy the strength and weight to the manufacturer.
I was tightening the shaft to pull out the pulley, the washer was damaged. Since it can not be helped, I purchased another pulley without pulling. I found that I sell washer only this time purchased. The clerk at the tool shop did not tell me to sell the washer. Be careful not to tighten in a strange way.