Can you supply new ear pads for RP-F300 headphones?

plenty of them here, http://www.ebay.com/sch/i.html?_nkw=panasonic%20ear%20foam

http://www.amazon.com/Panasonic-RPHJE120D-In-Ear-Headphone-Orange/dp/B003ELYQGG

Sony parts suppliers sell replacement ear pads. Part no 2-320-280-01 about US$16 each (not pair).
Old ear pads slip off - pull gently to stretch the part that sits in the groove of the headphones until one side slides out.

The creative sewer can remanufacture new pads from thin soft leather by following the pattern of the old ones.
No cost fix is to scrape off the remaining peeling urethane leaving the soft fabric backing. Headphones will still work but the soft earpads should absorb high frequencies.

Try this website
http://www.jntworld.com/catalog/index.php?cPath=21_1002&currency=gbp&osCsid=c5b2f0de48c59564afb36dfebba513ac

It is not a simple reconnect, the wires are tiny and difficult to connect (solder).

Please check your wires for malfunction then get it fixed.

See my tip on replacing dodgy cables plugs on headphones. Just click my name. Link to a site that sells them at the bottom.

Just flip the headphone pad inside out on the Optimus Pro 100 wireless headphones.
Find the 3 screws on each headphone speaker, you have to push the existing cover back, but you'll find them. Remove the 3 screws. Be careful of the speaker wire that will be attached to the cover plate that has the ear pad on it. Also, look carefully at how the components are assembled inside the headphone, as you might disturb their setting. They are easy to return to their proper place if they move.
Gently remove the ear pad, turn it inside out and you will have a new covered ear pad. GENTLY, re-install ear pad onto speaker plate, be careful not to break the speaker wire that is attached. I found a little flat screwdriver helps to pull the edge of the pad over the plate. The ear pad is actually quite strong and can take some abuse, but don't pull the speaker wires loose.
After you have the cover back on, find the screw holes and put the 3 screws back in. Presto, a little cleanup on any loose pieces of covering from the original side and your done for another couple years or so.

Solved my problem by finally finding the Panasonic parts dept.

If you try carefully removing the foam ear pad you might be lucky enough to find that the speaker plate is screwed to the backing cup. I hope this is true in your case. Some of them are just glued together. Hope this helps.