How to change a guide roller SR magazine

[Mohammed Tahir]

Hi,

 

One of the guide rollers in the SR magazine broke and I wanted to replace it. The guide roller sits on the swing-away arm that holds the film in place. There is a screw on the top but if I turn it, the whole thing turns. It looks as if I need to hold something in place before unscrewing it. Just wanted to check if the correct way to do this.

 

Thanks

 

Mohammed

Edited December 15, 2011 by Mohammed Tahir

[Dom Jaeger]

Hi Mohammed,

 

funny you should ask this, I just had exactly the same problem with an SR3 mag I was servicing today.

 

The roller spindle is sort of press fitted into the arm, so you can't actually stop it spinning if it's come a bit loose, at least not without removing the arm and trying to clamp the bottom of the spindle, or re-securing the press fit somehow.

 

But the force required to turn the spindle should still be strong, it's just that the force needed to undo the screw is greater. So the easiest solution is to try and reduce the screw binding friction. I got mine out by soaking the screw head in a rust penetrant/lubricant spray called CRC 2-26, something like WD-40. Then give the screw a short sharp twist with a screwdriver.

 

If that doesn't work try applying a little heat to the screw head with a soldering iron before trying again.