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The screw setup is a push/pull arrangement, the short screw is threaded through the lip on the lens cell and pushes against the front ring, the longer screw is again threaded through the lip on the lens cell but is threaded into the front ring and pulls the lens cell.
When collimating, you DO NOT take the lens cell apart, you use the push/pull screws to adjust the squareness of the lens and center your diffraction rings.
Before you do any of this though, I would still strongly suggest doing a proper star test to make sure it is out of collimation. I have done an FS-102, FS-128 and a Sky 90 successfully but you do need to take your time.
Cheers
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