Can we safely stretch our 12mm Dyneema DIY Main Mast shrouds & stays?

We had a mad rush to stretch our Dyneema on the special apparatus we had built in the garden. We had to finish before we left Manchester, and the shrouds were not finished until less than a week before we moved. These shrouds and stays were both much longer and thicker than we have done before, that meant big challenges for our garden rig. We are now living aboard full-time and this work had to be done if we are going to be able to get our main mast up. We have a frequently updated blog at https://sustainablesailing.net with membership options and a weekly newsletter at £2 per month for Early Bird Supporters. Our free Sustainable Sailing book is at: https://sustainablesailing.codeberg.p... Or visit our shop at https://sustainablesailing.teemill.com/ for great hoodies, t-shirts and bags. When we bought Vida in August 2019 she was in a very tired and damp condition with all original equipment and fittings (much of it not working). We have removed all the gas, diesel and paraffin equipment, and are installing all-electric (motor, cooking etc). More details on our blog at https://sustainablesailing.net/ Socials: Facebook: / sustainsailing Mastodon: https://mas.to/@SustainableSailing #diy #boatrefit #dyneema #chainplate #rigging