Note: This aluminum mast base plate is inlcuded in the standard spindrift rigging kit.
The base plate is common to all Spindrift models. It is 1/8" thick 6061 aluminum bent and drilled. Five countersunk #10 screws attach the base plate to the top of the mast step just behind the mast. Four holes on the aft (bent) face are for attaching the Harken 072 shackles which use 3/16" pins.