This leads to a discussion of door bolts. One in particular is interesting – a “dragging bolt” (neger hanagar) – that is attached to a door but with an arm which drags against the ground.
With a dragging bolt, one may lock [the door] in the Temple, but not in the country;
“The country” here is any location outside the Ancient Temple in Jerusalem. The bolt is allowed there, but nowhere else.
but one that is laid apart [on the ground] is forbidden in both places.
A non-attached bolt – one which is simply put in place through a door socket into the ground – is not allowed.
But there is controversy:
R. Judah said: That which is laid apart [is permitted] in the Temple; and that which is dragged, in the country.
Now it was taught: Which is a dragging bolt wherewith we may close [a door] in the Temple but not in the country? That which is fastened [to the door] and suspended — one end reaching the ground.
R. Judah said: Such is permitted even in the country. But which is forbidden in the country? That which is neither fastened nor suspended — but which one removes and places in a corner.
Interesting that the exception would even exist for the Temple doors exclusively. Also the attention to detail of the kind of bolt (attached or loose) used. Advance preparation (fastening - like the skylight prop) helps.