Hi Dave
Thanks for that - I have actually found another identical phone amongst my collection that has already been converted (its the same model but looks slightly different) anyway I plugged it in and it received calls and made calls fine but there was no dial tone so could not hear anything so unscrewed the earpiece from the other phone - there is a magnetic disc that was missing so transferred it to the converted phone and that works fully now but on investigating the wiring conversion its not the same as that post from 2011 but if it works it works so will continue on that basis - I need another of those earpiece metal discs - any idea where I might buy one (or is that not allowed on here apologies if not!) I will attempt to post the link to the 2011 article
https://www.vintage-radio.net/forum/...ad.php?t=69011 See if I can attach images of the conveted working phone.