Should you use the latch on an "Easy-Lift" Lid?

Should you use the latch on an "Easy-Lift" Lid?

A customer asks:

I have an Easy Fire kiln. When I fire it I lock the lid with the lid latch. A friend recently told me that this is incorrect and could damage the lid. Can you tell me if the lid should be locked during firing.

Answer:

The latch is there to be used to lock the lid in the front - otherwise it will want to rise slightly while firing. It is still free to move in the back to relieve stress from expansion.