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I drill my own, it's rather easy with a hand drill and either titanium coated bits or cobalt bits.
Run a length of blue painters tape around the cap, mark current hole locations, remove the tape and place evenly spaced marks where you want new holes, reapply the tape making sure it is level, place the cap in a vice or any wood corner in your house (I use a door frame in my garage) to hold the top cap steady, and drill away. A bit of oil can help keep the bit cool. For new holes it does help to have a hardened center punch and hammer to indent the location so the drill will not wander off of your drilling point, but good bits are easier to control these days.
Other wise, have the shop do the smallest holes in exactly the location you need, making them larger is easy. This might save you some frustration and a bit of cash. Machine shops aren't known to be cheap.
Maurice