I made a MHP this time too. Also just bent the HC and attached the heating pad to the underside to keep the chickies warm. Got the pad at Walmart for $12.
I'm so sorry.I am absolutely devastated. I put our first four Nankin peeps in the brooder. My EcoGlo brooder plate needs a new cord, which has not yet arrived, so I had a heat lamp on them. The lamp apparently shifted and I have four dead peeps - it took all of about six minutes. My poor babies. This was our best hatch ever - seven, so far, and now this. It's almost enough to make me quit. Almost.

Until your new cord arrives maybe you can make a quick MHP? Walmart and Amazon sell decently cheap heating pads without the auto shut off.