Just as the IRA|PIRA used kneecapping as a deterrent for crimes, the loyalists use a similar technique, on a smaller scale.
The IRA use a pistol in most cases - occassionally a shotgunto perform kneecappings. The Loyalists prefer a Black & Decker Power Drill for the same job.
For those offenders who seriously upset the IRA, who do not deserve death, and to be a deterrent to others, the IRA give out the 6-Pack - knees, elbows, ankles. Assuming the victim survives, he spend the rest of his life on crutches.
On an incidental note, whenever the Parachute Regiment or the Royal Marines were in Northern Ireland the number of incidents went down dramatically - the IRA were too scared of these units to cause too much trouble when they are around.