I know Ice used a 1/2" pvc plunger rod, which is why he is in need of a spring, because [k26] and [k25] springs won't nest over 1/2" pvc.
ORLY? Check the specs on the [k25], the ID is 0.952", plenty of space to use 1/2" PVC pipe.
1/2 PVC is a horrible plunger rod, for that reason. Look here.
It's a little heavy, but really could be worse. And that thread is an awful cesspool of misinformation dumplings slathered in a gravy of bad ideas. I mean, copper? Bullshit, you are not going to find 5' for $5. Come on people... PLASTIC.
What is the OD of the plunger rod for you SG?
What is the OD of yours (plunger rod) ice?
The OD of the "13mm spec" PVC pipe plunger rods i use is around 18mm.
The aftermarket springs i use have a 25mm ID so they have the sufficient amount of clearance to fit those PVC pipe plunger rods.
That is weird, man. Our two sizes of 1/2" are CPVC with and ID of 11-13mm and OD of 15.9-16mm, or PVC with and ID of anywhere from 13-18mm and OD of 21.5mm. Stupid imperial measurements and a ridiculous pipe sizing system designed to keep plumbing knowledge exclusive to professional plumbers combine to make it difficult to locate the sizes you use.