If the lead finial is not made by a skilled lead worker who understands how the lead moves when bossed, then the result will not only be an eye soar but will also result in a decreased life span.
When dressing or bossing lead it is very important to move the lead evenly to ensure the lead is not being stretched and excessively thinned out. If this is not done correctly the lead will fail and therefore crack on these weak spots. Whilst these cracks can be repaired by welding a patch onto the lead, this is not a permanent solution as there will more than likely be more weak spots around the finial which will also fail is due course.
The finish of a lead finial should be visually smooth without creases in the lead, large dents, and excessive welding.Whilst some welding may be unavoidable due to the complex nature of the finial, most of the finial should be bossed with any welds being scraped back and polished to make them very difficult to see. Unfortunately, it is very common to see a large number of creases, dents and welding on finials when made by unexperienced lead workers, therefore ruining the aesthetical look of the feature piece.