How to run a 32-bit plugin on 64-bit Mac in PS CS5?

Hi...

I have developed an automation plugin for PS CS 3,4 & 5 using CS4 SDK in 32-bit Mac processor.

Problem with this is that the plugin works for CS5 in 32-bit mode, but the plugin doesn't load when tried with CS5 on 64-bit mode. I made changes in the PiPL, but still no change. I referred the steps mentioned in the documentation for creating a 64-bit plugin, but in the "Step 3: Fix entry point and PiPL", it says that the entry point needs to be changed. But, the entry point mentioned is different from the Automation plugin entry-point. Can you please suggest a way to overcome this problem?

Thanks!