Right so im re-assembling the brand new A15 donk (pics up soon as soon as i can figure out how to?!!)

So im putting in my lovely new Waggot Cosworth cam after the lifters are in and im putting on the locking plate 1 bolt in good, 2nd bolt OH SH|T the bolt head has snapped off....!!

Now this is common a bolt head coming off if its old or worn down i agree, but is it weird that it looks like someone has already snapped a bolt shaft off in there & the hole is smaller than the other?????
Alright i admit it i used a different bolt than what was in there as i lost it but surley they should be all the same depth?
So i filed off both edges of the bolt shaft and twiseted it out with some pliers, fine....
But now i have to re tap the hole but i shouldnt have to surley!!!! (does anyone know the tap size?? M4? M5?)

So in conclusion some1 has failed at doing something to my locking plate bolt hole to and has left me a large chunk of the old bolt shaft in there, i hate this person sooo soo much!!!

Any advice or comments??
Cheers
Dave