This is how I make a 5g twisted mini skein from a cake of yarn for mini swaps. By leaving the yarn attached to the cake as you wind the mini, you can add or subtract yarn if you mini is too small or too big.
by BeyondBracelets
by LisaBrownInk
by Craft Creations_By_Damini
by Basic Craft
by Yellow Cottage Soapery
by thegreatMSG
by SuntekStoreTube