You must have a hell of a job trying to accurately centre punch a part that is critical prior to drilling when the wife has a wash on and is rocking and rolling in the spin cycle!Adjusters with the bigger thread were around (don't know from what) ,drilling out and tapping was a tedious process due to restricted access , All done without any machinery ,shade tree style!. My current workbench is the top of the wifes washing machine. And she objects !!. Wonder why?.