I used to have Graham 2.2, Phantom I, and now have Phantom II. I used to own a Dynavector XV-1s that weighed 13 grams. I didn't have problem with it using the Phantom I. Its counterweight is more than enough to balance the XV-1s. You might have misinterpreted something on Page 5. You don't need to buy adaptor.
Graham supplies the bolts for the arm base. But you can get it from hardware stores.
Graham supplies the bolts for the arm base. But you can get it from hardware stores.