Got to use my astro exhaust expander again today. Tool is amazing for exhaust repairs. Since getting the tool I've bought a 10' stick of each common size exhaust pipe. Needed to do a small repair today for a guy that just wanted ot patched where it rusted through. Cut out the bad spot and got a chunk of 2 1/4" pipe the right length. One side of his was 2 1/2" and the other was 2 1/4" where I cut out. So I just stuck my 2 1/4" pipe inside his 2 1/2" and clamped it. Then used my expander to open up my 2 1/4" pipe to 2 1/2" so his 2 1/4" would slide in. Clamped that and done.
I had a green lee hydraulic knock out set already and the draw screw on that has the same threads as the astro expander. So I just screw the astro expander onto that and now have a hydraulic exhaust expander. Works so slick and easy.