Broken Clutch Knob :(

I'm not sure if it's because it was really cold last night or the knobs are just cheap but... I was tightening the DEC knob with my hand and it snapped in half. It's some sort of metal. There are two products listed on the Celestron site and I'm not sure which is compatible with the CG5 mount. I submitted a help ticket. I'm wondering if anyone has put an alternate type of knob on there? I was thinking even something from the plumbing section... these tend to rub on the motor housing... I think the inside might be 5/8"?

e.g. http://www.celestron.com/browse-shop/spare-parts/clutch-knobs-compatible-only-for-the-cgem-series

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Celestron replied and said they don't have the part anymore for my mount. Ah whatever.. I'm using a wrench now and took off the RA knob too. Actually works much better, doesn't rub on the mount motor housings, feels more solid, and is adjustable with gloves on in the cold. Who knew cracking a knob would be such a good thing? ;-)