By Brian Lee Telegram & Gazette Staff Posted Mar 31, 2019 at 6:00 AM SOUTHBRIDGE — Having spent 25 years running Optimum Technologies, Randal Chinnock spent 2018 reorienting the medical device company to serve as more of a consulting practice for business startups. After reducing Optimum Technologies’ workforce from about 25 employees to just himself at 114 Pleasant St., it yielded the 9,000-square-foot Southbridge Tech Incubator, which Mr. Chinnock says is the only technology incubator in South-Central Massachusetts. Its mission, Mr. Chinnock said, is to create a workspace for emerging technology companies, particularly in medical technology, “where the various tenants …