Fore Check:
10.5mm is the BIG stuff, wait til ya start using T-2+(.281") minimum dia tubing for your Micro models
Seriously, I stopped using eye screws and eye bolts years ago on ALL models micro to LMR's. Depending on the weight of the model a Kevlar loop of 50 to 130lb material replaces the hardware and does a great job.
For all micro models I use 50 - 70lb kevlar. make a 1" long loop tied with an overhand knot, trim the excess loose ends below the knot. Dremel out your nosecone. I hollow most balsa and basswood cones to allow addition of nose weight if needed. Remember weight is the enemy every .01 gram is important. CA the loop in the tip of the nosecone with just enough CA to cover the knot.
Motor mounts can be made in several ways. if you have a burn 10.5mm casing or two laying around they can be used to cut 1/16" thick centering rings with an X-acto saw and mitre box. OR a much better, lighter method... buy die cut fiberboard rings from Totally Tubular or ASP. These thing are great! Your motor mount should be a 1" long piece of T-2+(.281"OD) tubing I use a 1/4" piece of T-2 (.246"OD) 6mm tubing as the motor stop, to this apply two T-2+/T-4 fibre rings 1/4" from the aft end and almost flush with the forward end, CA the rings in place. cut a slight notch in the edge of the foreward ring and tie 26" to 30" of 50 -70lb kevlar shock line to the motor tube, leading it out over the notch. I bring the line back outside the mount through the motor tube when inserting the mount into the model. CA or Epoxy the mount into the model body. When the glue is set drop the shockline back through the motor mount out the forward end of the body then tie on your nose cone to the shock line end.
If you want a motor retainer hook, one can be fashioned from .020 music wire, I've seen them made from paper clips but they are simply WAY to big and heavy for these little models.
I use 1/2" or 3/4" teflon plumbers white pipe tape as streamers/wadding. You can tie it directly to the shock line, baby powder the heck out of both sides before fold/rolling the streamer the first time. McMaster Carr has several sizes of heavier expanded PTFE colored teflon that is even better.
Altitude is directly dependent on weight in these little guys, 10.5mm models under 10grams will get you over the 100-120' mark. My micro interceptor .281" body goes over 200 feet, I have some 281" x 3" micro S/D and P/D models that have been
tracked to over 300 feet so the sky is really the limit
I'm going to try to stick a couple of pics of a nose cone with loop, .020 motor hook, and a minimum dia shock line mount below.
Hope this helps!
You might also want to join us over on the MicroMaxRockets yahoo group, there is a ton of data and info, plans ect there for the taking.