I just got a modest cordless reciprocating saw by SnapFresh https://www.amazon.com/gp/product/B089QGR718/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1
To run the thing we need to press two buttons at all times: not just the trigger but also that "Lock" button highlighted in red:
The owner's manual confirms that both need to be depressed for us to get any juice. So .. is this standard fare for a reciprocating saw? It is awkward!
Best Answer
The trigger lock is a mechanical safety mechanism that prevents the trigger from being pulled.
It needs to be depressed before the trigger can be pulled.
I would not activate the two buttons at exactly the same time, because I do not know it that would cause any wear on the unlock mechanism.
The trigger lock button is only used to allow the trigger switch to be pulled, so it does not have to be held when the trigger is pulled.