Here's a fun easy project for you. Grab yourself a small pine cone. Build a little wood mold that is about 1/2" wider and longer than the pine cone in all directions. The mold is a box with no lid basically...hey, this is just a play/practice exercise with great results. The pine cone is going to suspend right in the middle of the mold. The screw on a stopper I think is 1/4", feel free and correct me or alter the directions just slightly. Drill a 1/4" hole through the exact center on one of the ends of the mold. Using some thick CA glue, glue a 1/4 dowel on the end of the pine cone. You need to eyeball that dowel as good as you can so that it lines up as if it was going to go straight through from the butt to the tip of the cone. Slide the dowel into the drilled hole, nice and careful not to break anything. If the cone breaks off, just stick the dowel in the hole then glue the cone back on..might be easier glueing the cone to the dowel while in the mold anyhow. The dowel should stick into the mold about a 1/4" at least, because you want resin to cover part of the dowel too. Seal the area where the dowel went through the mold with some CA and accelerator just in case of a leak. Pour the mold with your clear resin. When cured, cut off the wood. Drill out the dowel. The drill hole is now the hole for your stopper mandrel. Spin it to the general shape of the pine cone, but not all the way to the actual cone, otherwise if you expose the cone you will need to apply a finish. Now you have a suspended pine cone in resin on a stopper. I've done some and they look pretty cool. Hope you can follow all that, or make enough sense of it to get you on your way. I understand about the video's, I can't watch them on my phone either.
And..finally, whatever Ed Davidson's<aka yoyospin> totorial says..is sure to be great. His stoppers and Yo-yo's are off the charts!!