I am having a few problems with my Frister Rossman machine from the 80s. It has been going great, and since it was serviced a couple of years ago it hasn't been used much. Recently I took it with me for a day course and it was fine. After that day, it seems to have gone backwards. The bulb is a bit erratic and I think the drive belt is either too slack or something else. When I start the machine it wurrs for a little while, and then goes after a few seconds usually with a little more pressure on the foot pedal. I am guessing this issue is to do with the drive belt.
How easy is it to either replace the drive belt, or tighten it? And if so, how will I know if it is too slack when I open up the machine? I don't care too much for the bulb, and I am assuming the machine is fairly safe as it was serviced a couple of years ago and not used much. It doesn't bother me that the light doesn't always work, but I am wondering if it is at all linked to the wurring noise at the beginning. I am assuming it is the belt but it might be something else.