90% of my weight plates are Olympic style plates with the 2" center hole. My remaining weight plates are 1" hole standard plates.
I also have a standard sized E-Z curl bar that I converted to hold Olympic plates with cheap Body Solid Olympic plate adapters:
I really like to do cable curls but only had a straight bar attachment. E-Z curl cable bars are relatively expensive so I converted my bar to a homemade cable ez curl bar using a #2 conduit hanger and some duct tape:
A #2 conduit hanger holds 1" conduit or a 1" standard E-Z curl bar. The hanger costs about $1.50 at any home improvement store. I found the 2" ring ($3.00?) at Ace Hardware.
A simple bolt and nut holds the #2 conduit hanger together. I took a hacksaw and cut off the remaining thread of the bolt so it wouldn't snag my clothing.
Even with the extra thread of the bolt cut off the nut still snagged my clothing on some exercises so I covered it with duct tape which did the trick. The duct tape on either side of the hanger keeps the hanger from sliding to the left or right. And because the hanger fits loosely around the bar it rotates freely.
So for under $5 I converted my E-Z curl bar to a cable curl bar instead of buying another attachment.
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