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I have a Trsf chassis. The rear aluminum wheel grub screw thread is stripped. I have some NSR chassis grub screws to install. I need to know what drill and tap I need for the NSR grub screw.
Thanks MikieG

Thread size is #4-40 UNC, tapping drill is #43.

Remember to lubricate the tap with tapping fluid or even some denatured alcohol, and back off the tap every half turn or so to break the chips.

Thank you sir!