Generally--Pending Actions. These rules and amendments promulgated pursuant to authority granted to the Supreme Court shall govern all proceedings in actions after they take effect, and also all further proceedings in actions pending on their effective dates, except to the extent that in the opinion of the superior court, expressed by its order, the application of rules in a particular action pending when the rules take effect would not be feasible or would work injustice, in which event the procedure existing at the time the action was brought applies.