[Mesorah] Ner Tamid

[Sholom Simon via Mesorah]

In the first pasuk of Tetzavah (Shemos 27:20), the last three words 
talk about lighting the ner tamid (27:20).  The Sifre (Beha'alos'cha, 
59) draws from that the common understanding, that the ner should 
burn continuously.

However, there is a tipcha under the word "ner."  Rashi seems to 
interpret the pasuk al pi the trop, as he says that the verse means: 
to light the ner, continually (i.e., it must be lit every night) -- 
although Rashi doesn't prove his assertion with trop, rather, he 
gives other examples of Torah's use of the word "tamid."

Am I understanding this correctly?  If so, does anyone have any 
thoughts about this observation?

Good shabbos!

-- Sholom