|
I am not familiiar with the M47. My experience is with M46od units. However if the plugs on the M47 are hex head I would suggest using either a six point box end wrench or a six point socket. Do not use a 12point. The six point will fit better and have less chance of rounding off the head.
You also might try holding the box end onto the plug with one hand and striking the wrench on the other end with a sharp hammer blow. This will give more of an impact to break the plug loose.
I would also give them a good long soak with PB Blaster or Kroil. Using anything else in an effort to penetrate is (IMO) a waste of time.
Randy
|