The lateral hard points consist of three links (turnbuckles) attaching pucks on the primary mirror to the mirror cell. Clean out the threads in the three pucks with a 3/8-16 tap, and oil these threads before putting the mirror into its cell.

1. Loosen the jam nuts on the links. Attach the links to the pucks and cell with the six 1/2-inch (3/8-18) shoulder screws. Be patient; they are easy to drop into the bowels of the mirror cell. There are generally holes to poke the Allen wrenches through for starting and tightening these screws.
2. Measure the distance between the inner edge of the mirror and the instrument stand at four 90-degree points. There are 1-inch holes in the inner collar of the mirror covers where you should make these measurements. Refer to AST-06-A08 for details about making these measurements.
3. Calculate translations for the primary mirror to center it on the instrument stand. Use these values to calculate changes in length of the three links per formulae in AST-06-A08.