+1
Buzz sent to me a set for for an intermediate (solent) stay tang and it is installed with structural rivets as per Buzz's specifications. The rivets are designed such that the center mandrel breaks off after setting the rivet, leaving a solid stainless post in the mast rather than a hollow 'rivet'. The now-solid post/rivet handles shear loads well. I have half a box of them left over from my installation and I've saved them for purposes of repairing the boom vang bracket. I got them from McMaster-Carr.
https://www.mcmaster.com/98778A528/
You can also get them as a flush-head finish that uses a counter-sink drill hole.
- rob