An ultrasonic liquefaction endodontic system having a graspable hand piece includes a contra-angle tip assembly that has an insert and an internal fluid flow passageway. At least one cutting blade serves as an inner cutting blade, and the remaining cutting blades serve as outer cutting blades. The connecting arrangement also is designed to accommodate slight misalignments between the shafts. The methods of the invention produces the shaft by providing a mandrel having the outside shape desired for the shaft’s inside surface; wrapping a ribbon of reinforcing material around the shaft in a spiral groove therein; forming the shaft body around the mandrel; and separating the mandrel from the shaft after curing, by unscrewing the mandrel. The method further includes determining that the identified merchant is registered to utilize the card network by comparing the transaction data with the merchant data stored in the database, forwarding the authorization request to the issuer bank, receiving a response to the request from the issuer bank, and automatically forwarding the response to the input device.