Probably not the correct section to post, but this will be of interest to all the solar observers....
Maier Photonics ( with some help from Dave over on the Solar Chat site

) have developed a replacement ITF which fits the existing holder in the PST eyepiece holder.
If you have a "blue" objective PST with a failed "mini-erf" this could be the solution for you.


Check it out.
http://maierphotonics.com/656bandpassfilter.aspx