Joined: Mar 2007
Posts: 9,165
Likes: 5,350
From: SF Bay Area, East bay
Bikes: Miyata 618 GT, Marinoni, Kestral 200, Soma double cross 2002 Trek 5200, KHS Flite, Koga Miyata, Schwinn Spitfire 5, Mondia Special, Univega Alpina, Miyata team Ti, Santa Cruz Highball, Waterford rs11
Does that bolt actually hold the post in place? Maybe have a piece of thicker material milled that half wraps that collar. https://www.grainger.com/product/GRAINGER-APPROVED-Half-Clamp-6RNC1?s_pp=false&picUrl=//static.grainger.com/rp/s/is/image/Grainger/6RNA8_AS01?$smthumb$