hi thatnks all for looking at the mock cathedral window.
no circle attachment. i just found a round thing in my kitchen, in this case the lid for an old tupperware pie saver. drew the circle cut it out and sewed.
i used the cheapest flannel i could find, $1.oo per yard at wallyworld, prewashed of course, instead of batting. they are pretty easy but these were bigger than the baby size i usually make. but no big deal.
if you do a search on this web site there are instructions on how to do this pattern.
use whatever size circle you wish.