Origin/Rega VTA adjuster?


I have just got the Origin threaded VTA adjuster for my Planar 2 and I cannot seem to fit it.I think the hole is too small for the adjuster and without banging it in with a hammer... Should I force it in,I thought these were supposed to drop in according to Origin?.Any advice appreciated
stefanl
Thanks for your response Twl,I have done the filing with the sander from a bicycle kit and that seems o.k.How do I set the nut and washer under the plinth? It feels a bit wieldy,can I leave the washer off?
I don't use the toothed washer myself. As long as the nut holds okay you're fine without it.

Don't overtighten the nut BTW. Hand tight or a pinch more is plenty. I agree it's pretty unwieldy.