I have a lazy susan bearing assembly (from Bunnings) on my 10"DOB base too.
What I have done is to secure (the original) bolt to the base (I screwed a small bike spanner in place to hold it firm) and I put a big washer and wing nut on the top. Easily accessible and (so far) good enough to increase the stiction as required.
Hope this is of help to you.
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