How do I make my Milodon Gear Drive NOISY?

As far as I know, that's the only way. I wasn't aware Milodon had a noisy and quiet set. I thought they were all noisy. They are straight cut gears as far as I know. Aren't yours straight cut? The honest to goodness quiet sets have angle cut gears and I wasn't aware Milodon made any like that.
This is what I was told, so I ordered...and the ***** is SILENT.
Really infuriates me.