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The original loop needs to be trimmed forward of the bogus welds, aft of the rear frame bracing plate (061973). You may be able to salvage the gusset plates, however fitting Mk3 gusset plates will give the new loop more support. Shorten the new loop to match this location.
Have short overlap tube stubs made (approx. 6*d long) which fit snugly inside the existing and the new tube. Tack or braze weld the overlap tubes into the remnants of the existing loop (allow 3*d to protrude). Install the prepared new loop section, allowing a small gap. Tack weld new tube section to the overlap tube stubs. Have angle and length measurements taken by a good frame to make sure the new loop is in the correct position wrt. length and angle before finalizing the fillet welds, joining the new loop section to the remnants of the existing tube and the overlap tube by butt welds. Lastly, weld (new or existing) gusset plates to the new loop by fillet welds. Good luck!

- Knut

Corrected for the correct term "tack welding"

<blockquote data-quote="mdt-son" data-source="post: 681220" data-attributes="member: 3823">The original loop needs to be trimmed forward of the bogus welds, aft of the rear frame bracing plate (061973). You may be able to salvage the gusset plates, however fitting Mk3 gusset plates will give the new loop more support. Shorten the new loop to match this location.Have short overlap tube stubs made (approx. 6*d long) which fit snugly inside the existing and the new tube. Tack or braze weld the overlap tubes into the remnants of the existing loop (allow 3*d to protrude). Install the prepared new loop section, allowing a small gap. Tack weld new tube section to the overlap tube stubs. Have angle and length measurements taken by a good frame to make sure the new loop is in the correct position wrt. length and angle before finalizing the fillet welds, joining the new loop section to the remnants of the existing tube and the overlap tube by butt welds. Lastly, weld (new or existing) gusset plates to the new loop by fillet welds. Good luck!- KnutCorrected for the correct term &quot;tack welding&quot;</blockquote>

[QUOTE="mdt-son, post: 681220, member: 3823"] The original loop needs to be trimmed forward of the bogus welds, aft of the rear frame bracing plate (061973). You may be able to salvage the gusset plates, however fitting Mk3 gusset plates will give the new loop more support. Shorten the new loop to match this location. Have short overlap tube stubs made (approx. 6*d long) which fit snugly inside the existing and the new tube. Tack or braze weld the overlap tubes into the remnants of the existing loop (allow 3*d to protrude). Install the prepared new loop section, allowing a small gap. Tack weld new tube section to the overlap tube stubs. Have angle and length measurements taken by a good frame to make sure the new loop is in the correct position wrt. length and angle before finalizing the fillet welds, joining the new loop section to the remnants of the existing tube and the overlap tube by butt welds. Lastly, weld (new or existing) gusset plates to the new loop by fillet welds. Good luck! - Knut Corrected for the correct term "tack welding" [/QUOTE]