A 3/4" copper pipe elbow JB Welded on one of them turns it into a 90 degree bottom-board heater and other is waved by hand over the top of the board.
Nearby parts can be protected with a little Kapton tape or other heat resistant shielding.
[0] https://www.amazon.com/gp/product/B0752Z4165
[1] https://www.amazon.com/gp/product/B000B61IHW
A 3/4" copper pipe elbow JB Welded on one of them turns it into a 90 degree bottom-board heater and other is waved by hand over the top of the board.
Nearby parts can be protected with a little Kapton tape or other heat resistant shielding.
[0] https://www.amazon.com/gp/product/B0752Z4165
[1] https://www.amazon.com/gp/product/B000B61IHW