Four screws are used to attach a mounting plate (PDS-10/20, APC-33) to the bottom of the SPD-SX. These screws are normally included with the SPD-SX.
If you have misplaced them, you can order a set through Roland's parts department. See "How to Order Replacement Parts".
Part Code: 40238145
Part Name: SCREW M5X12, TRUSS MACHINE BZC
* The screw size is: Threading and width = 10/32, Length = 1/2"
CAUTION: The use of incorrect size screws can cause damage to the SPD-SX. For this reason, Roland recommends factory replacements.