How to make a toilet seat hinge more stiff

Why not consider that the times when you need to move big things up and down the narrow stairs would be seldom and under specifically controlled conditions. For example think of a strategy where you only have the rail open when moving furniture up and down from the loft. This strategy can put a whole different spin on the type of scheme that you could use for temporarily removing the railing.

One approach could be to build the railing unit up in one or two sections and then bolt it into place using lag bolts or hex head bolts and T-Nuts embedded into the "mount to" frame if the stairway.

Another approach could utilize a mounting that worked much like the stake pockets used for truck and wagon side boards. These brackets look something like this:

This picture gives an idea of how these are utilized for trailer sides:

A similar scheme could be used for your railing whereby the sections of the railing could be simply lifted up to take them out and away for the furniture moving scenario. For safety sake a screw could easily be added through the bracket into the post to prevent accidental lifting out.

I will try to figure out your situation. You have only one door that has a good acceptable gap at the top and bottom, but a huge gap in the center. You have new door leaves you are installing, presuming the edges are still factory straight, or like factory straight, if you had to trim on the door to get it to fit the original jambs.. If the door has a 3rd hinge, the hinge in the easiest case, but not the best case, is just shimmed to meet the edge of the door leaf. It will be unsightly, but will work. The best case, would be to remove the trim at least on the hinge side of the jamb to get access to the shims, set the door in place, Do not install the pin in the middle hinge and shim the jamb over to get the barrel of the center hinge to line up, drop the pin in and reset the trim.

11-5-2015 edit to address the first comment below

Yes, to me there is a science, perhaps a sequence is a good term too, either way it will give repeatable results. In existing door jambs, check the jambs in all fashions, plumb, straight, parallel, square at top. If the hinges are not in line, they MUST be to get good results. You can simply use a straight edge for this. No, it must not necessarily be plumb, but it should be close, ideally with in a 1/4" so it is not a self closing or opening door. To shim the hinge, I prefer NOT to shim under the whole hinge, just at the edge of the jamb. This angling of the hinge to get the pins to line up will allow one edge of the hinge to stay engaged fully into the original mortise. Which I think, helps keep the hinge looking proper in it place, as much as possible. Shimming in this fashion helps eliminate another problem of "hinge bind".

As a note, hinges should not be set 1/32" below the face of the jamb, it should be just the opposite, 1/32" proud of the jamb, this also helps eliminate hinge bind. When set this helps give a slight more room for the door at the jamb. When the hinges are inset, closes the gap smaller and perhaps may allow the door leaf to hit the jamb before it is closed fully at the hinge side (hinge bind). The hinge when set the way I suggest also allows for the painter to have an edge to follow when cutting in around the hinges, aiding in a neater paint job.

After the jamb is understood and the pins are inline, cut the door leaf to size if needed. Scribing the top to match the head jamb so the gap is even. Cut the sides if needed to get the slab to fit in the opening with the hinges folded into the jamb. This fitment MUST be snug, not tight. When the hinges are cut into the side of the door, the gap at the slam side will be created.

Set your other hardware.