I place one pin staight in (at 90 degrees) through both blocks at the exact place of the points. Keep that pin at that 90 degree angle - don't make the 2nd entry into the fabric. Then I place one pin on either side of the first pin - very close to the first pin. Those two pins are inserted perpendicular to the fabric, coming in at a very flat angle - insert completely. Then I remove that first pin. If you insert a pin at a 90 angle, then flatten/tip it to make the 2nd stick, you immediately shift that top fabric, and your points will not line up. Hope can follow this verbal-picture.