Although my Solo has never been dropped or abused in any way, nor have I ever tried to squeeze in O-rings below the cap, I had the unfortunate experience of finding the baseplate on both of my Solos having cracks around the four screws. My guess is that the technician got a little over-zealous when they were assembled and over-tightened the screws.
A couple of folks had sent me PMs asking about what screws I used to replace the OEM ones on the bottom of my Solo. So I thought I would post here so all can benefit.
Here are a couple of pics taken through my my 10x jeweler's loupe showing the cracks around the screws:
So I went to my local Ace Hardware store and bought the following:
- Panhead Machine Screw, 2mm x 8mm, p/n 4306, 25 cents each.
- Flat Washer, 2mm, p/n 4298, 17 cents each.
The new screws and washers help alleviate some of the stress that was induced by the original screws. The new screws went in nice and snug with little effort.
Hopes this helps out.