Pavithra mothiram (My thread dated 26.12.12)

I have posted a thread regarding usage of Pavithra Motheram where Dharbai is not available. No advise or suggestions from anybody so far. But our reverred Swamin was quick to tell about availability of Pavithra mothirams at Madras. Then what for Pavithra mothiram is to be used? Narasimhan