Blocking the Bell Port
@badblocks Thanks for the tip. I live close to Paris and I feel a little guilty ordering halfway around the world (China) ... I will probably try FIMO or rubber hose at first.
@clint so far the durable SLA seems to work well, it's quite rigid and is holding up to daily practice. The 2.3mm was a bit too narrow for the sensor, it produced some held note behavior from the back-pressure with certain articulations. I think the next size up is going to be my keeper. Thank you again!