If you have a male thread on your lamp base and need to raise a lampholder up, use this Old English 75mm Spacer which has a male 10mm thread one end and a 10mm female thread the other.
The Old English Spacer has a clearance hole all the way through for the cable.
The Old English Spacer has a clearance hole all the way through for the cable.
Raising height 75mm with 5mm of male thread on top.