what did you do with your fazer today ?

[Robbie8666]

Sorry to hear of your little "mating" atempt with your bike.
That stud is known as a "hero blob" or a leaning over indicator, the idea is that on sharp angled leaning around corners (not laying on its side !) that bit of metal will grind on the road either before your exhaust dose or you run out of tyre. Some people take them off when the constant grinding becomes a pest. So no you dont need them and they are cheep enough to buy.
But im not sure why you describe them a tac welded as it is just a short rod with a rounded end and a threaded end which gos into your footrest 

Thanks for update.. I think that a previous ower must have had problem with them unscrewing or vibrating out as there is a small blob tac weld on both sides (just lood at replacement pegs £10 from HK not bad deal for a pair!!)