Marsh,
<br>I am a huge fan of port holes. I have at least one on each hull on all my boats except my new 14. I am not sure what kind of boat you have but since you mentioned pylons I assume it is a 16 or a 14. The problem with putting it between the pylons is it is sometimes hard to access. If you want to look inside it can be difficult to look down and see. Also if you have one of those hand pumps it will be hard to get the right angle to get it on the actual bottom of the hull. You can put them forward of the front crossbar and just have your crew sit on them. They should not crack unless the hull around it is soft, in which case it would crack anyways. Another good place is to put it behind the rear pylons like under the tiller assemblies. This one would have to be on the small size but its perfect for putting your hand in and sponging out. It is good for when a boat is on cat trax or tilted back. Just make sure you put plenty of silicone on it when your putting it on or you will have to take it off and re-do it. If you try to put it on around the edges it rarely stays. Make sure you are using a curved one if the deck is curved or a flat one if the deck is flat.
<br>-Todd <br><br>