I purchased my PT1 second hand in 1985, I believe the original owner got it in 1981/82 from WA Brady in Liverpool, it was fitted with an ADC LMF1 tonearm. I upgraded this to a Rega RB300 in the late 1990's, along with a funk firm achromat. In 2015 I took my turntable to peter @ #cymbiosis for a service and an arm upgrade. The arm was sent to Audio Origami for a rewire, replacement bearing and a foam fill. When it was returned I did an AB comparison with the LP12 majik, my PT was far superior in many respects. I believe that the Linn armboard is suitable for the Rega
I would strongly recommend that you only take it to a dealer who has experience with PT turntables. If damage is made to your turntable (such as a spring breakage) it might not be possible to obtain spare parts. My lid is looking very tired these days, but obtaining a decent replacement, at an affordable price, is difficult.