I just had a machine shop wield on a new plunger on my old and I mean old Scott creek steel extruder. We use two in studio every week for handles and other stuff.
This one has be modified at least 4-5 times saw well as been through 3 plungers now. They wear down and the barrel rusts larger so the clay blows by after 8-12 years. Since I bought this in the 70's from Scott Johnson (Scott Creek now) who later sold the Co. to Tacoma Calay Art center
If you know Scott Creeks then you may not reconize this one as His.
I have changed almost every feature to improve it. The plunger handle needed to be stronger so we added another steel support-see plunger photo-the newer ones now look like this
The cap was a pain to take on (three hole on a cast cap) and off and soon the holes wore out (rusted out) on barrel so I had a Brent cap system wielded on. ( I like the Brent caps as they go on and off fast and never seem to wear out)
The handle kept shaping bolts at pivot point so I added a way stronger guage machine bolt with lock nuts. The plunger was next to wear to small and this makes my 3rd one
The ratchet angle iron bent and I had it wielded to a larger piece of dual angle steel two years ago. The handle pins at top long ago gave up and new one was added about 15 -20 years back.
I chipped all the rust out yesterday from the steel tube and painted up the new plunger to slow the rusting down. Now all that is original is the tube and its going to maybe make it all the way but the end looks ragged so I ground it smoother and made it finger friendly .
This old extruder has been a workhorse .
I have a wall mounted pipe style Brent as well on other wall-Its mote heavy rudy from day one and so far has been trouble free.
Porcelain takes its toll on this stuff but with modifications one can make it last.
One last point on the pluggers they get smaller from wear-they do not rust out. The barrel has rusted larger(gotten bigger diameter) as well.