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| Joined: | Sat Feb 29th, 2020 |
| Location: | Norman, USA |
| Posts: | 5 |
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| Posted: Tue Dec 8th, 2020 04:05 am |
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Mark Crumpley
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Does anyone know for sure what material was used in the 1977-ish Hartman sprint kart frames? Mild steel, 4230 or ??? Thanks!
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