Will the Phantomrest damage the end-pin and destabilize the tail-gut/ tail-piece connection?
This was one of our chief concerns when we designed the Phantomrest. We discussed with our local luthiers, did extensive research on the web, consulted various treaties on violin making and came to the conclusion that the end block is one of the safest places to anchor our shoulder rest. The reason being, the end-block, in which we house the end-pin, is actually one of the two strongest structures in the violin, the other being the neck joint. When a violin is properly set up, there is a up to 60kg or so force pulling on the end-pin via the tail gut. This effectively jams the end-pin within the end-block.
We have also performed an experiment with the objective of testing the maximum force one can apply to the violin. In this picture, the balloon pressure meter registered 120 mmHg when I flexed my neck with all my might. Since the resting pressure was 20mmHg, the actual force that I could apply to the violin was 120-20 or 100mmHg, which translates into 1.93 LB (0.87kg) per square inch. Since there are only about 5-8 square inches or so surface area on any chin rest, this translates into 10-16 LB (4.5-7.3kg) force.
In the second set of pictures we documented the experiment we performed to test how much force that is needed to dislodge the end-pin. You can see that even up to 25 LB (11.3kg) weight over a 24-hour period did not do any visible damage to the end-pin. We therefore conclude that under normal playing condition, it is extremely unlikely that one can dislodge the end-pin using the Phantom shoulder rest.