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.
The OD of the "13mm spec" PVC pipe plunger rods i use is around 18mm.
What is the OD of the plunger rod for you SG?
What is the OD of yours (plunger rod) ice?
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.