Trim support in mountain lion for third party ssd

Hi,
I have an Intel 320 series SSD in my intel core duo 2008 2.6ghz macbook pro.
I had trim support enabled in Lion and tried to re-enable it with the usual terminal commands after upgrading to ML.
The first two commands to back up and patch the new file appear to work, but when I try to clear the 1st cache using:
sudo kextcache -system-prelinked-kernel
I get the following error:
Kernel file /mach_kernel does not contain requested arch: i386
Then in system information after reboot it says that trim has not enabled.
Does anyone know how I can re-enable trim support.
Many thanks,
Simon

Solved by shurcooL
http://forums.macrumors.com/showthread.php?p=15444235#post15444235
I tried this and it wouldn't work for me. It backed up the file, but when I tried to open the .kext file with the same editor he used, it wouldn't allow me to open it. I also tried logging in as the root user and didn't work either. Any ideas?
Macbook Pro 2012 model, 10.7.4, Intel 320 series 120gb SSD

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