wings515

I am looking to hard mount my Bosch 1613EVS to my table saw extension. I need to know the thread size for the three mounting screws that attach the plastic base to the frame. It is item 54 on the exploded view. The closest I can come to a match is 4mm x 070 but the tap does not easily go all the way through. I would like to use flat head screws to mount the router to the table saw thus utilize the table saw fence as my guide. Thank you, wings515