No I actually enlarged the holes so I could get the coil to adjust to the flywheel for the air gap. Yes it's very tight....I just make sure it's not grounding on something or you will have no spark.....don't ask me how I know...lol. On Makita I super glue a small washer to the mounting post to lift the coil a hair which helps then on top to make sure it's secure. As you've noticed the spark plug wire is also very tight. It all comes togather with patience and wiggling. I don't even take the spark plug wire out just unscrew it from the original coil and screw it in when it's ready to fit everything. I will put the fly wheel on to be able to set air gap and make sure you can get it close enough. Once you get that done it's tim ye to grind the key off the fw. You should have your crank, fw and case marked before this. Once you grind the key off put crank at t