A bridle ring that reduces potential wire abrasion, minimizes magnetic interference to communication signals, and is easier to install. Citric acid may optionally be present. A pin is inserted through a bore in the core and through an attachment bar with ends received in wells in the core. Either way, the switch will be turned off under normal current flow and will not be subject to destructive over-current or over-voltage conditions. The aforesaid further allows a surgeon to position the ultrasonic generator handpiece at any rotational angle for provision of the benefits cited. The access facility forms an enclosure for a component of the exhaust gas aftertreatment device.