If you have a male thread on your lamp base and need to raise a lampholder up.
Uuse this Nickel 38mm Spacer which has a male 10mm thread one end and a 10mm female thread the other.
The Nickel Spacer has a clearance hole all the way through for the cable.
Spacer Height: 38mm
Total Height: 43mm
Outer Diameter: 12.7mm
Internal Hole Size Female End: 9mm
Internal Hole Size Male End: 7mm
Male & Female Thread Diameter: 10mm
Male & Female Thread Pitch: 1mm
Male thread height: 5mm