It appears that that is only going to be a problem if you are wanting to use the font which you produce in conjunction with some specialized equipment such as a computer-driven engraving machine or something like that. If you are just wanting a font for ordinary use on computer screens and in printed pages, then that is not an issue at all.
In TrueType fonts one does not produce something like a thin circle by drawing one thin line, even though the result of using the font might look as if that is how it is done. One draws two circular contours, one within the other. The outer contour is clockwise and the inner circle is counterclockwise. The outer contour produces a black filled circle. The inner contour, because it is counterclockwise, produces a white filled circle. Thus the total effect is of a thin black circle as if the inner white disc is covering most of the black disc.
Such a font can be drawn directly in FontCreator using the Insert Contour… facility. Suppose that you are wanting to draw a letter A, not an A like in the Galileo Lettering font, just an ordinary A as if drawn with a pencil on a piece of paper. One way would be as follows.
Open the glyph window for the A.
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Insert Contour… then click somewhere in the glyph window so as to be at the outside top of the A.
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Then move the mouse down and to the right and click again.
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Then just a little left and click again.
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Then up and left a bit and click again.
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Then a bit left and click again.
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Then down and left a bit and click again.
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Then just a little left and click again.
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Then click on the first point so as to close the loop. That is, eight clicks producing a closed loop of seven points.
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Next use Insert Contour.. and position the mouse a little below the very first point and click.
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Next move the mouse a bit down and left without going outside of the original loop and click again.
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Next move the mouse to the right without going outside of the original loop and click again.
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Next click on the point produced at stage 9 so as to close the loop. That is, four clicks producing a closed loop of three points.
There should now be a display in the general shape of the letter A on the screen. It is now a matter of moving individual points around so that the desired final shape is achieved. If points are not showing, double click on the background and they should then be displayed. A point can be moved by selecting it by clicking on it and then using the arrow keys of the keyboard. This can be done with precision as the coordinates of the point are displayed on the lower bar. Using the arrow keys alone is ten font unit steps. Holding down the CTRL key while using the arrow keys is one font unit steps. Holding down the SHIFT key while using the arrow keys is one hundred font unit steps.
Producing the effect of a thin black line in the display is by moving the points so that the inner contour is almost the size of the outer contour. The exact values depend on the design that you are trying to produce, though as a figure to give an idea, I mention that the thickness of the vertical lines in the Galileo Lettering font is 32 font units. Less would give a thinner line, more would give a thicker line.
Positioning the points in the example so as to get a good design of an A may take some experimentation, yet hopefully the above notes will help you get started. Please notice how the lines of the A at the lower left and at the lower right are both produced using two parts of the same contour whereas the lines at the upper left and upper right and across the middle are produced as being between two contours.
There is, in fact, a thread about the Galileo Lettering font in the Gallery forum.
That thread is about other aspects of the font, so I am not suggesting that it needs to be read in relation to the present discussion.
http://forum.high-logic.com:9080/t/galileo-lettering-font/834/1
William Overington
12 March 2008