I need to make some of these parts, bearing is just there for size reference. Roughly 1 inch long and 3/4 inch wide and 1/16th thick. 3 inline holes 2 different sizes and the outer profile, tight tolerances not necessary. Would a punch be the best way to make these? Where can I find some info on what material to make a punch out of and the process, clearances needed between halfs, etc.