SACD/CD Drive Mechanism Replacement

Greetings!

I apologize in advance if this is a stupid question…

I’m  considering purchasing a used SACD/CD player.  I’m concerned that at some point the drive will give out. 
 

If I bought a replacement drive for it right away and just stored it; can anyone install it when the time comes, or must the original manufacturer do it?

I appreciate your help!

Best wishes,

Don