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Orestis, would you happen to have an old Kodak film canister with its lid somewhere at home? Maybe your folks do. You can make a quick and effective collimation tool with one of these. They happen to be a perfect fit in a 1.25" focuser.
You need to drill two holes dead centre in the lid and base about 4mm in diameter. Stick it into the focuser and you can first check the centering of the secondary, and then the primary's collimation.
There are a few sites that can help out with this type of direct optical collimation. Very quick, effective, cheap and will get you by if you still feel you need something more fancy.
I use one of these film canisters to centre my secondary mirror on all my newtonians, including Odessius.
Mental.
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