Steering Column Collar/Housing Install Issue

Hello, I am rebuilding a steering column for the first time on my 1968 Dodge Dart GT with floor shift. Overall things have been going well but I hit a snag trying to install the housing and bearing housing. It seems that they don’t pinch down tight against each other at all even if I tighten the two square-headed bolts (though one seems stripped). I can spin and separate the housings basically with just a couple fingers. My questions are: Is there a trick to get these to pinch down better? Is there a place that reproduces the two square-headed nuts and bolts? Will this be an issue or unsafe? Thanks!

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