Stuart was offered a contract by Glasgow over the summer, but then found he was one of several players who then found the deal was not ratified by the SRU.
"The way they sacked me left me with no option but to get lawyers involved, " said Stuart.
"They backed me into a corner by changing their minds about renewing my contract. The late timing of their decision meant I had little chance to find a team.
"I was actually on the brink of packing in the professional game but then I was called out to Australia as cover for the Scotland tour and the Borders came up with a package.
"The legal issue is history as far as I am concerned as I am enjoying my rugby again, and, yes of course, I want to be on the winning side against them."