| As an artist we use a variation on these pens which are not quite as mechanical in feel,to make them proceed as follows-
You can use sticks of balsa wood tapered to a point or bamboo ( the sort used on those cheap blinds obtainable from £ shops etc ) once you have the taper simply make a slit with a razor saw at the tip,at the top of the slit drill a small hole,this acts as the reservoir for the paint/ink,balsa wood pens have been used for years by artists and model makers,they absorb just the right amount of liquid,are expendable and user friendly,the bamboo variety are used in Chinese painting and ideal for use with acrylic paints.
You can also make your own spring bow pen by taking two flat narrow strips of bamboo,bind these with cotton at one end,in the middle spread the strips with a small piece of balsa or cork,now take a thin piece of flexible wire and proceed to tighten up the points to the desired width,sharpen the two points with a knife finishing off with sanding smooth,thats it dip into the liquid and you will have the finest little modelling painting tool,and it costs nothing !
__________________ 'And there I was oil on my goggles from a broken pipe,then I looked at the altimeter,all I could see was the makers name !' www.wonwinglo.scale-models.net/ | 
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