Ride, Wrench, Swap, Race
Join Date: Jan 2010
Location: Northern California
Posts: 9,194
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
Mentioned: 132 Post(s)
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Quoted: 1565 Post(s)
These kind of binder arrangements are actually the best imo, mainly because the ordinary kind of 8.8- or 12.9-grade "socket head cap screw" tends to be a lot stronger than the typical, shouldered and headed "Cr-MO" binder bolt. I've never broken one!
The nut should be on the left side. And the nut (if it doesn't press-fit into the lug socket on the left side) should be fixed in place with Loctite or other adhesive.
Lastly, the seatpost slippage may be remedied by simply lubricating the bolt/nut threads, which will better convert bolt torque into clamping force, while lessening the unwanted turning force on the nut in the lug socket (so the bolt can draw up tight instead of the nut just spinning in it's bore).