[Al Skierkiewicz]

Bfirst
You have to be a little more specific as to which dowel pins you are talking about. If you are using pins through a gear and shaft to hold it together (assuming a solid pin and not a spring pin) you can use a center punch to spread the metal at both end of the pin. Again you will not get the assembly apart without damage. Another trick that is harder to do is to cut a slot for an "E" ring around the outside of the gear and use the ring to hold the pin in place.