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I faced the same issue on a previous Orion dob. The fix is quite easy by rotating the spider veins 45 degrees in orientation. That gets them clear of the focuser so you can install the filter slide under the focuser.
I have the Moonlite slider on my dobs. It is a high quality machined aluminium and black anodised slider. The Astrocrumb is a timber slider. It is nice but not anywhere near the quality of the Moonlite.
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