This was something to be expected... The machine had obviously been stored in not too great conditions for years and I suspect it had been plugged on 220v a couple of times...
When I removed the bulb I noticed it was a 25 watts bulb (although a Singer original) and I was wondering if it is not too strong. On all my other machines it is recommended to use a 15 watts bulb but I couldn't seem to find any information about that in the manual. What do you think?
In any case I'm ordering a led bulb to avoid any overheating in the future 😉