Super small YAG laser cavity

Hey guys, I recently got this tiny ND:YAG rod for free as a gift. I am wondering how the heck should I make a cavity for it? I have 20mm mirrors coming in the mail, but I’m not sure how I’m going to get it to work, I’ve been having the privalage of using rods with integrated mirrors, but I’ll need to find ways to perfectly mount the mirrors I guess, but back to the cavity, is anyone here good with making them? Please some tips would help. Thanks! I was thinking of using a camera flash lamp because they are the same size (super small!) pictures are below in the link and album titled Small YAG
https://ibb.co/cmOcFc