You are not alone, most of us when we start do not know what to expect oe even what questions to ask.
I have had no problems with Marchant except that the ball screws I won on frightbay were unmachined and that meant more bits for my lathe, a collet chuck for one and then carbide cutters so as to machine them.
In hind sight I should have paid for them to machine them but its easy after the fact plus I have now got a collet chuck.
In fact I should have waited and bought a mill already converted but if we all waited until.... nothing would be learnt all.
I for one dont think any of us doing cnc conversions relaise the baptism of fire that awaited us!!!
You could look into trying to straighten the screws but you will need some more tools but leave the manchester spanner (hammer) alone!
Aftre all you have nothing to loose as its bent and wont work well.

Peter