How to repair a separated seatpost head:

(NOTE - this only applies if the glue holding the head in place on the post has failed. It is NOT APPROPRIATE if any metal parts have snapped! The repair is only holding critical parts _in place_, not taking any major stresses itself)

This seatpost is from right about the era when Syncros manufacturing had been moved to Taiwan and their stuff started to suck.. Same design (mostly) as the classic ones, but the quality had clearly gone to pot.. On a ride a while back, the head came unbonded from the post, causing the seat to swivel around freely. Not a disastrous failure, luckily, but it rendered the seatpost useless. Here's how I fixed it:


Separated post and head:


Insert head, line it up, drill a hole, and use a 5mm thread tap to make threads:


All the way through. Not shown is coating the mating surfaces of the post and head with JB Weld. The bolt is essentially there as an extra precaution against another separation (since glue didn't hold up the first time around, apparently). No photos because i didn't want to get JB Weld smears on my camera


Back on and lined up, excess JB Weld wiped off:


Standard bottle cage bolt, 5mm threads:


Screw it in:


And tighten!