Falcon Eyes SP-4F8F Adapter Pin Female 1/4" + male 3/8" (32mm) ... Read More
You should use the Falcon Eyes SP-4F8F 32mm Spigot Adapter to stretch the existing screw thread to get the right thread dimension. The SP-4F8F is 32 mm long and has a female thread of 1⁄4" and male thread of 3/8".