thickness of avid pad spacer??

Hi. I need to bleed my avid juicy brakes and the youtube how-to vid says it's important to use the avid pad spacer - which i don't have.
Is anyone able to tell me how thick it is so that I can use a washer or penny etc?
Thanks
Tim
Is anyone able to tell me how thick it is so that I can use a washer or penny etc?
Thanks
Tim
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Parktools :?:SheldonBrown