Home Made boring head adapter / backend. Is this accuracy OK ?

Guys,

I managed to get my hands on a small Walter boring head a few years back as part of a liquidation sale. Single point with 0.0005" movement per indentation on the body.

Never needed it until now, so it just sat in a cabinet.

Thing is, Walter's own holder (NCT system) was costing a fortune.

So, I turned a piece up myself and put it in a 16mm side-lock holder (CAT 40 - Seco EPB).

From the spindle flange to the lowest measurable surface on the boring head's body is an approx. distance of 6 inches.

I'm getting a run-out of 0.001" (0.02mm). Taking in and out of spindle and re-clocking several times, this figure is repeating consistently.

I'm sure Walter's own NCT adapter should run in and around 0.00025" as its a taper and face system.

So what do you guys think ? Should I just be content with this and leave well alone...

If I break it down and try to chase this I may make it worse...

TC.