[R-390] Filters

[quartz55]

I have my 2K and 4K filters removed from the IF.

The 4K appears dead in the IF.  Input and output windings show 51 ohms, to ground the output measures 34Meg, the input measures 370Meg.

2K in the IF appears to have high loss compared to 8 and 16K filters.  Input and output windings show 53 ohms.  To ground output measures infinity.  Input measures 5.3Meg/1Meg depending on which way I use the leads.

82pf caps appear good.

Any recommendations for taking them apart?  I've read the articles and the sites with pictures on removing the ends, but I'm still a bit confused about when heating them, how do I keep them from blowing apart with the build up of heat?  I see a nubbin on one end of the filters, right in the center, output end, does that cover a hole?  Or should I just drill a hole in one end before heating them?  They appear to be the later filters, buff colored so there's no connection of the input and output ends.

http://i251.photobucket.com/albums/gg287/DogTi/R390A/filters_zpsb692cc43.jpg