Bit of a strange one,but I have come across this issue a few times in the past.
A SES oven lamp won’t screw into the socket because it’s too loose.
I can recall on odd occasions having to remove a treaded sleeve from the old lamp then fit over the new lamp thread to increase its diameter by a couple of mm so it’s a snug fit in the socket.
Unfortunately the customer has thrown away the old lamp so the aforementioned sleeve is not present and I’ve no idea where to source one from.
Cheers.
Noel.