Peck minor causes more tenderness accross chest and under collarbone apply pressure from the front scalene muscle go into spasm an pull up on the 1st rib apply pressure from the top into your anterior and medial insertion points you will be able to tell a difference usually scalene and 1rib is the primary problem and peck minor is more of a secondary entrapment point I've had a 1st rib resection with anterior and medialscalenectomy and a peck minor tenotomy peck minor relieved anterior shoulder/sub scapula/and rib pain is was out pt and back to work on day 2 no meds 1st ribeesectionwasnt horrible but I was down for about 3 weeks nothing like the drama people hype if up to be but everyone is different?