When I put the 300 kit on my MC18 I needed to put longer leads on the coils. A friend X-rayed one of them and found it to be a normal coil - lead setup. There is a spike that comes out of the coil and the lead gets impaled on that to make the connection. The kicker is that the lead is very securely potted into the coil housing. It took much digging and scraping to get the old lead out and the socket clean enough to put the new lead in. I used RTV silicone to hold the new lead in. It turned out very well.

Peter