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If you can, unscrew the end of the PRIMARY baffle tube. The later versions have a two-part baffle that obscures the center dot completely. The end is about 4cm long and if removed, you'll reveal the dot at the extreme edge of the front.
If you have the one part tube, unscrew the entire primary baffle from the primary retainer. Be careful to tighten properly and not to do this too many times. You can unscrew the primary retaining ring as the entire baffle screws into the center of this ring.
Failing all of this, a pair of precision calipers may be helpful (measure the ring thickness at the collimation screws.
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