You'd really like those rack or mudguard mounts on your mountain bike frame or add disc brake tabs to your old frame and fork.
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       |-->   I can add these missing parts to your frame.

If one of the welds or joints breaks on your frame or if you'd like your frame reinforced for heavy duty use.
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       |-->   I can repair or reinforce your frame.

Your old frame only takes 1" forks and you'd like to have a more recent 1 1/8" fork
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       |-->   I can replace the headtube on your frame (The frame length will be shorter by a few mm !)