Without wishing to be an insufferable negative nancy (just call me nancy) brass isn't going to stop that propagating, and welding it will create an unsuitable HAZ, so not sure how salvedgable it is without new seat tube :(
@deleted started
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Without wishing to be an insufferable negative nancy (just call me nancy) brass isn't going to stop that propagating, and welding it will create an unsuitable HAZ, so not sure how salvedgable it is without new seat tube :(