I was using the wrong size drift pin for years and didn't know it
I was lining up some 3/4 inch plate holes for a boiler job last week, and my foreman asked why I was struggling. He saw me using a 1/2 inch drift pin on the 7/8 inch holes. I told him that's what I'd always done to get them close before the bolts. He just shook his head and handed me a 3/4 inch pin. The fit was perfect, no hammering needed, and it saved me about 15 minutes of fighting with it. I guess I just grabbed the wrong one from my kit when I was new and never questioned it. Anyone else have a simple tool habit they had to unlearn?