I am just assembling an Aerotech K1103X motor, and the instructions do not deal with a plugged forward closure. Do I assemble it as per the instructions, treating the delay grain like a smoke grain, no drill out for time adjusting and obviously leave out the BP? If so, what about the forward delay spacer, will it fit, I am also inclined to grease the forward closure. One other thing I noticed is that the forward closures advertised for sale these days are standard and plugged but threaded? I was going to use my non-threaded, any reason why I shouldn't? I do have the plugged threaded as well, so it's no issue to just use it.