TI-66 double speed mod

[Nigel (UK)]

No, the screw holds the case together. The battery cover can be prised open with a flat edge. Remove the batteries, then remove the screw. Then just gently prise the two halves of the case apart - they are held together with clips. If all you want to do is to change the resistor there’s no need to go any further.

Nigel (UK)