There are Many things that can render Tefillin or Mezuzah not Kosher or at best minimally Kosher.
Some of which happen over time with aging and some unfortunately are Posul from the get go.
Letters, words and or Tagim that are missing, extra substituted, touching, Broken, Improperly Spaced, misshapen faded, cracked and weather damaged.
We document the problems we find and periodically upload them to the website.
We hope that this will educate and encourage the public to purchase only Tefillin and Mezuzas that are high quality from a reputable source, to take care of them properly and have them checked regularly.
Q.What should you do if you bought or received as a gift a nice Stone Mezuzah case from Israel and you discover your Mezuzah does not fit in the case?
Either buy a new smaller Mezuzah, or put this case in your breakfront for display and purchase a new case the correct size. Folding a Mezuzah and inserting it sideways is not the solution. A Kosher Mezuzah needs to be rolled upright from left to right like a scroll, so that if we were to open it from the right we would be able to read the text.
In addition the fold in this particular Mezuzah was so sharply creased that it broke all the letters on the crease and the Mezuzah was no longer Kosher.
Lesson: Have a certified Sofer insert your Mezuzos in your case for you, to ensure that it will be done correctly.
Rabbi Kass was ordained by Rabbi Yisrael Meir Lau, former Ashkenazik Chief Rabbi of Israel. He is certified as a Sofer for both Kesivah and Hagoah by one of the leading experts in Safrus, Rabbi Avrohom Tzvi Vosner, Rav of the Vad Mishmeres Sta”m.