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Xyzzy writes –

This was an attempt to make a RumblePak for my DS Lite. Sure you can buy them for a few $$$, but where is the fun in that?

I wanted the Rumble Pak to fit into the existing blanking plate of the DS Lite that slots into the GBA cartridge slot. This would make it blend in with the NDS and not stick out or have an odd colour. I could have used the PCB that is contained within the blanking plate, but didn’t want to ruin it in case I had to send it back. I opted to dismantle an old Pokemon Pinball GBA cartridge and use the edge connector.

Instructables DIY RumblePak for Nintendo DS Lite – Link.