Why persevere with a design that is bound to fail? When we first got our +2 the signs of failure were present and having thought about it I went looking elsewhere, eventually finding this bunch:
http://www.miltonrace.co.uk/Wonderfully old school, confirmed by the great pic on the front of the brochure, but also keen on providing kit that works.
See P10 for the engine mounts I fitted. If it's not obvious, unlike the shear failure in every direction Lotus mount, IF this were to fail it does so in a failsafe way. The likelihood of this happening however is about 0 as the polyurethane bush is in compression.
The first set I fitted from Milton I was worried that they might be a bit too stiff and decided to soften the bush by drilling radial holes - see pic. These were then fitted and lasted 5 years until I had an engine fire that destroyed the front of the +2 - now still in rebuild! Worked perfectly.
Over time we acquired a Vegantune Evante - couldn't afford a baby Elan. Trying to sort the carbs out when we first got it discovered they were supporting the engine. With no time to get from Milton it was into the workshop and a short time later a pair of mounts using spare polyurethane suspension bushes - not radially drilled. This helped solve the carb problems and we do not get any more vibration. Easy to make and fit.
Many thanks to the Milton brothers!
(you may have to work out the pics, I cannot see how to re-order them and they are reversed from my upload sequence!)