Welcome to the DSC board! I see it's your first post. I hope you stick around - another modern SS rider to keep me company.
I had Neil at Cornerspeed fix the b*stard cut out in mine. Cost less than £20 I think.
I understand the attraction of the DIY route, but perhaps an email direct to Neil and he could give you some pointers. (info@cornerspeed.co.uk). Otherwise, someone will be along in a moment that knows more than me on this.