Gender Bending My Male Papaya Tree

I am now embarking on an experiment of my own in my backyard. I am trying to get a male papaya plant, which yields no fruit by the way, to produce female flowers so that it can bear fruits. I accidentally came across some blog posts saying that this 'gender conversion' is possible. However, the details are a bit sketchy.

At the moment, I have 2 male papaya plants, both measuring about 5 feet tall. I have driven an iron rod right through the trunk of one of these male plants, at about 1.5 feet up from the ground. As the theory goes, I have to stress the plant out somehow so that it will trigger some hormonal changes that will cause female flowers to be produced.

So far, after about 2 weeks, I have not seen any changes to this plant yet. If there is still no development over the next couple of weeks, I may take a more drastic measure, like cutting off the top part of the plant for example. These 2 papaya plants were planted about 5 months ago, with seeds taken from the same fruit. I am beginning to wonder if all the seeds from this particular fruit were male.

During the last 10 years, after having something like 20 odd papaya trees, only 3 were male. Some were planted by myself while others got germinated thanks to help of the birds, rats and squirrels within the neighbourhood. Of the 3 male plants, two were as mentioned above, and one that I had about 10 years ago which is my first male papaya tree encounter. Back then, having not seen male papaya flowers before, I was puzzled with the rather peculiar bloom. It was only later then that my Mum told me that they were male papaya flowers. I subsequently chopped the tree down since I only want fruit yielding trees (who wouldn't). With 3 male trees out of 20, the odds are not too bad, I think.

The male papaya flowers are different from the female papaya flowers. Male papaya flowers can only be found on the ends of a long flexible flimsy stalk branching out from the main tree trunk. I have seen some stalks growing up to about 2 feet long in length. Female flowers on the other-hand are attached to the tree trunk, which makes sense since papaya fruits can be quite big and heavy when growning on a fertile soil. Both male and female flowers look quite similar - white petals with orange-gy center.

Update: 5th June 2014
After 6 months, my little experiment did not work. I even tried scarring the trunk with a sharp knife. The male flowers are blooming with no signs of any female flowers of any kind. I will be chopping down the male papaya trees soon.