Train Buffer Beam with Sealed Magnet - Type 2 (91994)

[Philippe Hurbain]

Hello Yuntao,

Wow, two new parts authors in two days!!! excellent!

I don't have the part, just follow the photo to modify the appearance from 64424 and 64420.
So, I'm not sure the screw was the correct size, and I don't know their part number, too...

Your parts look good, compared with LDD version. Maybe the "screw" (actually on this part version it's rather a pin, since there is no slot in the head) is a bit too long according to this photo by say two LDU. (edit): a friend measured the depth, it's actually 1 LDU.
I don't know the part number for the pin/screw either, you'll have to use a uxxx name after asking LDraw part admin for a number range.
The part number for the element you named "beam" is 91968.

Can I share these parts at Parts Tracker? How can I do?

You need to ask LDraw part admin for a LDraw parts author login, see "submit new parts", after that you'll be able to send part to Parts Tracker.

And I also need to modify which contents of these part files?

They already look quite good. The main problem is that some of the areas you modified have inverted surfaces ("inside out"). You can see that using LDView BFC red/green mode. Elements that appear red are inverted.