Some important things that you might want to keep in the back of your mind for future reference.

1/ Many small customers currently use air operated cap tightening equipment and in some cases delivering a mixed bag of results. One thing that many overlook is:- because of the nature of the chuck used (manly a round aluminum disc which has a rubber insert internally) you only manage to get grip on the top surface of the closure. Because you are limited in friction between the rubber insert and the cap the application torque becomes inconsistent and therefore the customers set the air operated motor to the maximum to achieve a positive seal.

This is fine, however they get into this gray line where they strike striping of lugs due to  over tightening the closure. Unfortunately this is the main problem with this type of operation.

Many years ago the closures produced were manufactured with thicker tinplate making the lugs much harder to strip/jump thread when applied at a higher torque application. The air operated capping would probably suit this combination.

A few years ago, the metal plate manufactures like BHP Biliton declining to continue to supply this heavier gauge tin plate, the closure manufactures had to alter their equipment to produce closures out of thinner tin plate where we sit today. Although the tin plate is thinner, the closure design was trialled and accepted by the large volume customers as being commercial.

2/ With the customer changing their capping equipment to the Weird and Harrod type capper, (This is an inline capping machine which have 3 to 4 stations) coming in contact with the closure. These stations have round rubber rollers which spin continuously on ether side. As the container moves through each of these stations, the cap is tightened accordingly. Each of these stations can be independently adjusted which means that the application torque can be much better controlled then the air operated type.