That is one nice scope Gino. Just beautiful. Nice eyepieces too,
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I've got the same laser collimation tool too. I'm glad you've got a cheshire eyepiece too. You'll find it handy as you may find that there is too much slop in the fit of the laser in the 1.25" focuser. Even when the laser is held in tight in the focuser, you can still move the thing quite easily. Sadly it is a common problem with it. Happens with mine, and with every other one I've seen.
Solution is easy. You'll need to use a permanent marker pen to mark the centre of you secondary mirror. This won't affect the performance - don't forget, the secondary mirror is a larger obstruction to the incoming light than any tiny texta mark could be. With the Cheshire check that your secondary is in its opitmal position, then swap with the laser and make sure that the laser is pointed at this tiny dot. The rest of the collimation process is no different.
I've had to do this to my own 17.5" secondary. This process also showed me that the focuser on my scope wasn't truely square as it should have been. I've now got as good a collimation proceedure as I'm ever likely to have, regardless of the collimation tools I may use.
You may also need to collimate your laser collimator too! Mine was out by 0.18 degrees. Not much, but it makes a difference at the wavelengths of light. That's not difficult either. Here's a link to
collimating your GSO laser collimation tool.
Mental.