[silent:arts] said:there is just no "safe way" for a DIY seller ...
it is not that easy and expensive to sue outside your country - might be a way: only do private sales outside your country.
I gave up on this topic.
Paying insurance for all possibilities?
You would need to add this to your sales price.
Still in the DIY range? no!
I am not a legal but, if I remeber fine, is possible to insert on sale conditions, that, in case of legal disputes, the competent court is that of seller's country.
However, I am thinking on tube DIY gears, liability issues are a problem. I these months I have designed a tube preamp, I have intention to put it in the market, but reading this posts I have just changed idea !!
It work at 200VDC, is not a big power voltage, because it has ECC88's, but it is however a potentially dangerous voltage.