I have VPI and Graham TNT armboards cut for SME & Graham 2.X respectively. I believe the 2.X pattern is same as Phantom? It's not practical for me to overlay these armboards right now, but I looked at it awhile back. Overlaying the Graham cut-out and drill pattern on top of the SME pattern is feasible but unsightly. The Graham pattern is a 40mm diameter hole encircled by four drill points 40mm apart. The SME pattern is approximately 70mm x 32mm elongated hole with four drill holes at corners 60mm x 42mm. My recollection is that none of the corner holes line up.
You'd probably have better luck starting fresh with a used Graham armboard for about $200 or a piece of 11" x 4" hardwood. Alternatively you could cover the area with a 1/8"- 1/4" brass plate.
You'd probably have better luck starting fresh with a used Graham armboard for about $200 or a piece of 11" x 4" hardwood. Alternatively you could cover the area with a 1/8"- 1/4" brass plate.