udev USB keyboard add/remove multiple events

[lyallp]

Hi,
I am trying to do the eudyptula challenge and one of the tasks is to load a kernel module when a USB keyboard is inserted.

The only problem I have is that my udev rules file triggers 4 times when I plug in a USB Razer Blackwidow into my Gentoo VM via the Virtualbox USB control.

Whilst, technically, I am able to meet the challenge requirements by simply going through the module load 4 times (3 times superfluously), I would prefer to load/unload only once.

I figure I need to examine an ENV value for a specific value but am unsure as to which one is appropriate. I suspect the additional firings are for things like LEDs.

I am only looking for assistance on what to look at, not how, but I guess this forum topic would be a good place to put some educational material on this matter.

My current rule file, whilst overly verbose and quite capable of being only one line, is as follows:-

[lyallp]

I have a solution, but am unsure if it is 'correct'.

Basically, I look for ID_USB_INTERFACE_NUM of 00 and when the DEVNAME is blank.
If these 2 conditions are met, then I will load my module.

Suggestions welcomed.

Revised Rule file