I either go to East TN Steel Supply in Knox or Noble Metals here in Oak Ridge. Since you wont need a full stick of anything I'd prolly just go to Noble. They sell pieces or you can find scrap laying around and get it for cheap.
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so i didnt notice when i picked them up but the arms i got from pull a part are bent some where they bolt to the beam... could probably just bend them back into place but might pick up another set sometime this week. thats why theres been no progress.