Noticing that we were all walking around like Cowboys, someone suggested we fix the seat. It transpired that the seat angle adjustment (normally a set of interlocking surfaces) were worn smooth. No amount of tightening would fix that.
No problem - Out with the welder. We fixed those pesky worn gripping surfaces good. Then we coralled up that darned chainguard and shot a bead of weld down it's crack. It was cold before it knew what hit it.. (Knock off the cowboy talk...ed)