I have a line on a used mag kit with one 4370 and one 4371 mag. for a good price. The problem is that the Slick kit as offered by aircraft spruce has a 4373 mag instead of the 4371. The difference is the 4371 has 20 degrees of delay(?) while the 4373 has 25 degrees. What is meant by delay or lag and does it make any difference for my 0-320b3b?