According to Rashi's first explanation (Refer to 26:4:1:1**), the one Amah (socket), according to his second explanation (Refer to 26:4:1:1 [Sifsei Chachamim])
2)
How did the 30 Amos length of the goats-hair curtains cover the width of the Mishkan?
1.
Rashi: There was one extra Amah past the first curtains, to cover the exposed Amah of Kerashim on each side
1
. Only the sockets were exposed.
2
2.
Rashbam (9): There was one extra Amah past the first curtains, to cover the sockets, which the first curtains left exposed.
According to Rashi's first explanation (Refer to 26:4:1:1**), the one Amah (socket), according to his second explanation (Refer to 26:4:1:1 [Sifsei Chachamim])