A पूजाविधि (a mode of worship). If you perform a पवित्रारोपण worship you will get the benefit of worshipping विष्णु for a year. This worship is to be conducted in the months of आषाढ (July), श्रावण (August) प्रौष्ठपद (September), आश्विन (October) and कार्त्तिक (November) A sacred पवित्र (sacred thread or ring of कुश grass) is to be prepared either in gold, silver, copper, cotton or silk. A specially purified cotton thread is also enough The पवित्र is to be made of three threads woven together. The पवित्र is to be made holy by reciting 108 times the गायत्री mantra or even half of that number is enough. Reciting 108 times or more is considered to be उत्तम (best); half of it is considered मध्यम (tolerable) and less than it is considered अधम (worst). The पवित्र should then be tied to मण्डलस् and the mantra to be recited at the time of tying it, is this:

ॐ नारायणाय विद्महे वासुदेवाय धीमहि तन्नो विष्णुः प्रचोदयात् . (Chapter 34, Agni Purāṇa) .