Long headshell required

Thanks for all of your suggestions.  Since I'm not prepared to cut out the plinth, it's the best way to improve the P2S distance.  It wont be perfect but it will be close. 

Does anyone know of a long SME headshell?

Because of the base of the tonearm, EPA100, being so large it is difficult to move it closer to the platter and hence the P2S distance is short.   Having a longer headshell will rectify this, rather than dig into the plinth.

Appreciate your suggestions

Thanks again for all of your input and suggestions. 

To explain the scenario - EPA100 tonearm has a large/wide mounting base and it's going onto a plinth where the arm board position doesn't allow it to get close enough to the centre (unless I cut into the plinth).  It is close to the right point and sounds good but is not optimal.  My measurements show that an extra 10mm length on the headshell will get me very much in the sweet spot.  I have moved the cartridge in the headshell as far along as it can go and it improved the positioning.  I'm using an alignment disc template to determine where it needs to go.

I was thinking of fabricating something and what @imhififan has suggested makes it clear what could work.  Obviously need to manage the weight and balance

It's certainly not optimal but I want to do something for the interim.  I need a different plinth but that's not in the budget right now.

I will give this a go :)  thanks

Thanks again for everyone's advice

Yes, it's a Mk 2.  The calibration disc does not show the algorithm unfortunately,

I will try mounting the arm again and see if I can achieve the correct P2S distance.  If not, it will be time to get a different arm