Hi TECSHARE, thanks for your advice. Sorry, what is the locking system that you mean?
for now , Our seedplate support 12 words and 24 words passphrase. the plate with 4 holes, we can lock multi plates with hex nut and drivers.
I just mean some device to lock the plates together so they can not be opened and viewed. I assume people will be keeping it hidden anyway, but suppose some one does find it a way to mechanically keep it closed might be useful such as with a code or a key. I have seen other designs that have a rivet that has the two sheets attached at one of the points so they slide past each other to open and close, then a lock can be placed thru the opposite side to hold it shut. It seems as if you hope to sell some extras, and some kind of small lock might be a good addition to your shop. Either way I like this setup. It is simple and utilitarian.