Bernard Consumables / Center Fire replacement parts. Bernard & Tregaskiss Patented Centerfire parts have been difficult or imposable to find and increasing in cost. Consider reducing your production costs by switching back to the Original Elliptical style "twist" contact tips and consumable parts. Replace the CenterFire tip, nozzles and tip holders with efficient lower costs parts. OEM quality contact tips, nozzles wire conduits, diffusers and necks for Bernard Q style Mig guns.