Plastic parts for the Soemtron ETR range of calculators are now around 50 years old and have reached their end of life becoming extremely brittle, none more so than the cabinet latches that hold the two-part covers to the main chassis. These seem to be the first items to break.
Plastic mouldings in the ETRs were sparingly used (EG. Decimal point and mains switches) and do seem to have been quite well made in most instances, but 50 years on since their manufacture they have become prone to sudden disintegration. Some items, like the keyboard guide plate suffer from stress fractures whilst not actually falling apart. (Above right)
So, starting with the cabinet latches of which we have had multiple failures, we have designed replacements and had them 3D printed. These are direct replacements for the original latch parts in the ETR220 and 222 units and require no modifications to fit, simply unscrew the old broken latch and swap with these new parts. We have stock to hand so for price and delivery contact contact us, or email us .
We also have spares stocks of other Soemtron items including -
Contact us, or email us for prices and shipping.