Observation: Without this, we could have asked [a contradiction between] the Reisha to the Seifa, for [the Reisha] calls it dragging (on the ground), and [the Seifa] calls it "high above the ground', and we could have said "ul'Taimech (also for you it is difficult)"!

Explanation (Ri): We discuss when they have a hinge pin (on which the door swings). If not, why do we discuss Delet Almanah? Also another door (one may not use it to close the opening)!

Explanation #1 (Rashi): He arranges eggs on an iron Kli called Gardil in old French (grill).

Objection (Ri): This is not the way of Binyan! All the Mechitzos are already made. This is unlike a barrel or bed, in which he arranges one [Mechitzah] next to another.

Support (for objection): There is a widespread Heter to place a pot on a tripod [on Yom Tov. No one forbids due to Binyan for Machshirei Ochel Nefesh!]

Explanation #2 (Ri): He arranges wood or eggs, and puts an egg on top of them.

Implied question: We arrange a loaf here, a loaf here and a loaf on top of them, or similarly with a Sefer!

Answer #1: It is forbidden only when he needs the air underneath them.

Answer #2: It resembles Binyan only when he does so on land, but not on a table.

Explanation #1 (Rashi): From here we deduce that R. Meir retracted from [his stringency about] garden gates, and he does not decree about one who stands in Reshus ha'Rabim, that he may not move [items in a Karmelis];

Source: The porch is a Karmelis like we say below.

Rebuttal (Ri): We cannot prove from here [that he retracted]. We can establish that tomorrow he opens and closes, e.g. when he stands on the porch.

Support (of Rebuttal): We must explain like this, for if he stands in Reshus ha'Rabim, why does it say "and similarly", which connotes that it is like the case of garden gates [that we permit]?

Explanation #2 (Ri, and Rashi's rectification): It is proven from the Seifa that R. Meir retracted from [his stringency about] garden gates. It teaches that above 10, he places [the key] in the lock, and tomorrow he opens and locks;

Even if he stands on the porch, this is from a Karmelis to Reshus ha'Yachid;

You are forced to say that the porch is a Karmelis, for if it is Mekom Petur, why does he need to place the key in the lock? He should leave it on the porch!

Explanation: "And similarly" connotes that it is like the case of garden gates [that we permit]. If the porch were Reshus ha'Yachid, if so he transfers from Reshus ha'Yachid to Karmelis!

Similarly, if [the porch] were Reshus ha'Rabim, he would transfer from Reshus ha'Yachid to Karmelis, and it is unlike garden gates, which we forbid in such a case.

Explanation: [We do not say Chokekin,] and it is Mekom Petur.

Implied question: Why does it say "he leaves it on the porch"? (Since the lock is Mekom Petur, he could leave the key in Reshus ha'Rabim!)

Answer: [Indeed,] the same applies (he may leave it) in Reshus ha'Rabim, but normally it is not guarded on the ground. Therefore, [the Beraisa] did not say so.

Question: It says in Nedarim (81a) and Pesachim (51a) that if something is permitted, and some people's custom is to forbid, you may not permit it in front of them!

Answer: That is when they know that it is permitted, and they are stringent on themselves lest people get used to being lenient, and they will come to permit Isur;

However, if they are stringent due to a mistake, you may permit it in front of them.

Explanation (Ri): Only here it is permitted, because there is a ball at the end (which can be used to crush peppers, so it is considered a Kli);

If there is no ball at the end, [R. Yosi] agrees that it is forbidden, even if it is tied to the door. He holds like Rabanan of R. Yehudah regarding a bolt that drags [on the ground - they forbid it below (102a)].

Alternatively, [R. Yosi] holds like R. Yehudah, who permits [a bolt] that drags. Here we discuss what is tied to the bolt. R. Yehudah agrees [that it is forbidden] when it cannot be taken through the rope attached to it, like is proven below;

This is why he requires in our Mishnah that it has a ball at its end.