6. All of the self-examinations, whether they are the hefsek tahara or one of those during the 7 clean days, must be made with a clean, old, white linen or cotton cloth or a white wool cloth.  It is inserted into the vaginal canal and into its holes and ridges until the point of maximum penile penetration.  She must look to see if there is any redness on the cloth.  She may not insert only a little bit and wipe herself.  If she has difficulty with such a deep insertion, at a minimum the examination of the hefsek tahara and of Day 1 must be to the point of maximum penetration. If she did not do so on the first day she should do so on one of the other days.  However, it is acceptable if she did not explore that deeply and just checked holes and ridges.
    

7. A blind woman checks herself and shows the eyd to another woman.
    

8. Someone who can hear but not speak or speak but not hear is considered like a normal person.  However, she who can neither speak nor hear, is an idiot or is temporarily insane due to illness requires a normal person to check them and to maintain their vestos so that she may be permitted to her husband.  If such a woman has a fixed vesses, she can be treated like any woman who has one; otherwise, she must be examined every 30 days.
    

9. A woman who performs additional self-examinations whether on her 7 clean days or at other times is considered praiseworthy even if she has a fixed vesses.

The Pischei Tshuvah notes that if the self-examination is extremely painful, she only needs to perform those of Days 1 and 7, as we previously learned.  He suggests that on the other days the woman do some form of examination, even an external wiping, if she does not experience pain by doing it.

Rav Wozner opines that an appropriate size for an eyd is 7 to 8 centimeters square.  He also says that one may use any type of white cloth, including synthetics and even, in case of necessity, paper, as long as the material is absorbent.

The Chasam Sofer states that the proper method of performing the self-examination is with one foot on a stool and one foot on the ground.