Matsya Purana 285.3

285.3

tapanīyasya śuddhasya viṣuvādiṣu kārayet.
śreṣṭhaṃ palasahasreṇa tadarddhena tu madhyamam .. 285.2

On the day when the Sun enters the point of equinox or on any auspicious day an image of golden Viśvachakra (the wheels of the uni verse) should be made The image of 1 000 palas of gold is the best, of 500 palas is medium and of 250 palas is the Kaniṣṭha If the devotee can not afford much he should get an image of over 20 palas made It should however not be less than that—2 3