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Rega P3 - Arm hole too small?

I have had my P3 for a while now and just change my cartridge. I now need a 4mm spacer and the regualr nut is no good so I had to get the extended nut. Problem is that the nut doesn't fit in the hole. I dremeled out the hole bigger but the hole is now slightly irregular. I only had to dremel the bottom half and not go near the top where the plinth is. Is this a problem at all? I'm thinking as long as the nut is tight I should be okay. Am I wrong?

Thanks,
Steve
toysd09f
viridian's avatar
viridian
4,184 posts
 
It should not be an issue if you use a conventional protractor to set the overhang. However, if you use the Rega three hole mounting scheme, the stylus will not be in the proper plane, though this mounting does not conform to the common Baerwald formulas anyway.
toysd09f OP
7 posts
 
Just out of curiousity why would it not work anymore with a Rega protractor? I should mention I did not touch the upper surface of the the hole. The top of the whole (plinth)is the same diamater as before just about 5mm and under all the way to the bottom is where I dremeled. So 5mm under the plinth the whole becomes irregular.

Thanks again, I am a little inept when it comes to working with my hands so I just want to know if I caused any harm.
viridian's avatar
viridian
4,184 posts
 
The overhang, which is fixed with the three hole mounting, is determined by the pivot to spindle distance. You have changed this distance if you have moved the position of the arm. With two hole mounting the play in the headshell will allow you to compensate by moving the cartridge in the headshell.
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