Alden, it is not the end of the world to tap a 1/4-20. The reason for finer threads IS the material. The 1/4 carries a larger head screw and may not land. You need 3-4 threads to be effective. If you work all that out, install screw with two finger torque. You have at least two posts on this, please be sure you read every word of advise. Missing the Hotrod post, or any other, can cause you grief. There are many options, none are easy and have some risk and take some skills. I'm sure you will be fine at whatever you decide. It's not a decision of no return, you can get another bowl.
