Remember

Answer to חידה

Remember not to make the same mistake as 'יואב בן צרוי*

(זכר זכר או זכר ולא זכר (אמבצי

*Zechor (remember) Zecher or Zeicher (are correct) but not Zochor

There is a Machlokes between the Minchas Shai, who

claims you are supposed to pronounce "Zeicher" with a

Tzeirei and the Heichel Habracha who holds to pronounce

it with a Segol, ," Zecher".

The Minhag is to read it twice, Zecher and  Zeicher.

The Ma'aseh Rav (134) writes The Gra originally

read "Zeicher". Later in life he changed

his mind and read Zecher..

It seems, that the Gra. would only read it one way  Zeicher

or Zecher and not both.

*Bava Basra 21b