What is this cylindrical black component with a wire looped through it?
Try this: -

6 hole ferrite bead suppressor made by Wurth: -
Characteristics

Impedance will increase with more turns, available in 1 to 3 turns
4 different materials available for perfect interference suppression
Also available ready-bent or in individual length
Maximum current capability is 3 A / 5 A (short-time)
Operating temperature: –25 ºC to +125 ºC

Application note
Different manufacturers have slightly different hole layouts: -

VK200 Inductors.
This one is made by Ferroxcube: -

Purchase link