I just purchased a Technal 500 Dry Mount Press from the auction site. It arrived with a useless, shattered red knob. Not the knob that controls the temperature. Rather, this was in the middle of the press and was attached to some sort of bolt. I'm imagining this is used to increase/decrease pressure. I'm still able to turn the bolt but am not certain what I'm doing.
What does this bolt do and how is it used? Will the press be just as uselful without the red knb? Do I need to be able to turn the bolt at all? The thing seems to heat up nicely and otherwise appears intact.
Any assistance/advice would be appreciated.