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Install problem with nikko stirling scope wheel

Just installed my second nikko stirling scope on a rifle. This one will take a scope wheel but I am having a heck of a time
getting it on, swfa was no help nor legacy sports.

I can get it over the IR adjustment wheel "have the focus knob an IR knob both lined up at the 6 and 12 position" the set
screws are backed out all the way and I seem to me applying ample pressure but it won't slide over to the focus knob position.
Any one had this problem? I'm wondering if some light filing might be the answer as the focus know tabs are a bit taller than
the IR tabs.

Any one have any suggestions?

btw It is the 6" version I am working with.

Thanks, Randy