Dolan Pre Cursa / PreCursa / Track Champion

I have one of those MKS 8mm chain tensioners. Doesn't fit my (2011) Pre Cursa. Combined thickness of frame track end + replaceable steel insert is greater than 8mm, so cannot be fitted without prior modification.
This guy seems to have managed it (on the inside of the frame)...

(more: http://www.pedalroom.com/bike/dolan-pre-cursa-track-bike-15147)

... So must assume this frame/insert combo is <8mm. Maybe newer models have thinner dropouts because this isn't possible on mine. Also, that rear hub is secured with weedy M6 bolts, so probably does need the assistance when DAWSing or whatever it was called.

If it arrives and doesn't fit, you could:

• cut off the end of the insert, but then you'll have to fit the tensioner on the inside (as above), with the possible bonus that the tensioner won't want to sit flat against your dropout. Frame will also look weird with part of the insert removed.
  
• grind down the entire thickness of the insert (bench grinder + belt sander?), while causing abrasive/heating pain to your fingers. You could file it, but it would take forever.
  
• file the tabs from one side of the tensioner, which will make the part want to skew away from the dropout.