2" Crayford Focuser on New Orion XT8 Will Not Move Up & Down

[Hobbes_Is_Real]

I have a new Orion XT8 telescope.  I took it out the first night and was only able to look at a few things (Moon/Mars/Saturn) due to cloud cover.  Tonight was my first real chance to use it.  At first everything seemed fine, but as the nigh progressed the 2" Crayford focuser stopped moving up & down even though the focusing knobs continue to spin.  I could push and pull the focusing tub up & with very decent amount of resistance. 

Is this a common issue that can fixed by any adjustments by me?  Or is this a potentially more serious problem with a brand new telescope where I should contact Orion to replace?   

[Ricochet]

There is a smaller silver lock knob on the underside of the focuser. It might be that you have just inadvertently tightened it and locked the focuser position. If you loosen it the focuser operation may return to normal. 

[Hobbes_Is_Real]

That worked!!!!  Thank you.  Actually when I loosened the screw, it was so loose, I was worried about it eventually falling out without noticing in the future.  Since it seems to do fine with my biggest 2" lens and I don't do any astrophotography (since I classic Dob).   So I actually removed it and put in the zip pocket in my lens bag for whenever I might need it in the future.