I have used the light bulb method and it works. The ceramic (may be plastic now)holder on the board is a must. I use 150w bulb and it gets real hot and must get hot to work. The bulb must not touch the case or it will burn the case and could cause a fire. The DVD two disk set "Those Fantastic Featherweights" by David R. McCallum is well worth the money and will pay for itself the first trip to the shop it saves you. You can contact me off group if you have more questions.
KenZ