So after about three weeks of frustration I replaced my lens mirrors and tube

So after about three weeks of frustration I replaced my lens mirrors and tube (240 dollars later) my k40 is working great again. Well almost great I forgot to tighten the nuts on the mirror and now it’s misaligned but that is an easy fix. But I found a 50 on eBay for 800 and I am thinking about pulling the trigger and upgrading if I do how is the secondary market for a upgraded k40?

I purchased a stock K40 that was a few years old with some issues with the moshi board for $150 shipped a few month ago if that helps. It actually works great now after fixing the issues which cost about $20.00