Now (on the new layer) set your foreground color to black and, using your draw tool, set to the following and draw two intersecting lines on your doughnut, these lines should intersect at the exact middle of your image.  Your cursor should be at these coordinates (your coordinates are given in the lower left hand corner) for each line.  To begin the vertical line start at 150x0 and go all the way to the bottom of your image, keeping your line straight.  To make the horizontal line, begin at 0x150 and go all the way to the right of your image:

 

Your image should now look like this:

 

You now want to duplicate this layer.  Click on your Layer Palette button to open the tool.  Right click on layer 2 (or whatever you have named it) that contains the lines you just drew.  Choose duplicate.  This now gives us an exact copy of the layer with our lines on it to manipulate.

Making sure you are on the copy layer, go to Colors - Negative Image and click.

 

This now makes our black lines white.  Using your mover tool, move the white lines so they are 1 pixel left and 1 pixel below the original black lines.

Your image should look like this (use your zoom tool to enlarge your screen to better see what you are doing):

 

We now need to play with the properties of this layer.  Click on your Layers Palette button to bring up your layers.  Right click on our duplicate layer and go to properties to bring up the Layer Properties dialog box for that layer.  Set the blend mode to Soft Light and click OK.

 

Your image will now look like this:

 

 

Create a new Layer.  We are now going to create inset lines on the sides using the exact same technique you just did to create the other lines in your image simply by varying the width of the single line that you started with.

I used a line 3 pixels wide.  Once your lines are all in place, do as we did before.  Duplicate the layer, chose Colors-Negative Image. Remembering your light direction, move the white lines 1 pixel to left and below of our original black lines.  Then change the Blend Mode on your copy layer to Soft Light.

This technique works best on Horizontal and Vertical lines, but does not translate well to diagonal or circular lines.  You can place your lines anyway you wish, I did mine horizontally to get the following image (note use your Grid Lines by going to View - Grid to help you place your lines accurately)  Your image should now look approximately like this:

 

We will now create some screws to the right and left,
top and bottom of our vertical and horizontal lines.

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