OK.
how many of you got the starter dead signs and went to change it, only to find the bolts were wallered out by a previous "mechanic" or in your attempts to use not quite the right tool or without adequate preparation and cleaning you wallered out or stripped the head of the starter bolts?
whose idea was it to use 10mm allen head bolts on such an EXTREMELY difficult to reach and extremely tight bolt?
many stores sell external damaged bolt extractor sockets. like this:
anyway, if you use this correctly it can remove the bolt!
get the bolt clean!
get good clearance to swing a hammer.
set the 19mm version of the socket on the bolt head and pound it onto the bolt really really well.
then with good pressure and a decent hinge handle or a ratchet and a cheater. remove the bolt!
easy.