I recently picked up a Durst M600 that was complete for $15. Most of it is in good shape but it needs a bulb and one of the lens looks scratched. I know there is an issue with the durst of having the right lens holder for certain sizes of lens but I have both holders. Can I use other makers lens in this enlarger or is the Durst just such an odd ball that I'm stuck looking for a Durst replacement lens?