Alternate Knob for VSR TDC

I thought that the original knob for ksakpi's tdc mod had a potential weakness in that the whole for the bolt ran all the way through, meaning too much force could break it loose. I added a domed cap so that the bolt is held in place by the extra layer. I'm yet to test it so watch this space! Link to orignal: https://www.thingiverse.com/thing:1808598