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Tools for assembling cast iron radiator sections? Push nipple type radiator
Foolishly I attempted to remove a couple of sections from a cast iron radiator, which is of push-nipple construction, with rods. I've found good advice here: I see where to get replacement nipples, I'll use a thin bead of high-temp RTV on the flat surfaces when reassembling, I'll test with air and water before returning to service.
What I don't understand is how to get the dang sections all the way back together. Using four pipe-mounted woodworking clamps with as much elbow grease as I can muster leaves a visible crack between sections.
Should I lay in with the mallet? A wooden frame with hydraulic jack? Three dozen strap wrenches? What do the pros do?
I confess that I'm re-using the existing nipples, would that explain a poor fit?
(Posting to MAIN WALL as my searches yielded dispersed hits.)