(another) Prewar Flyer Chugger Tender Problem

[AF53]

Trevor, not sure if this was part of your previous answers so maybe this can help.

http://www.portlines.com/portlinesclinic8.htm

Good luck.

[tjl0824]

Previously I had asked about an overheating chugger tender, but the suggestion of changing the sealing grease in the tube solved the problem. Now I have another one, and this one is different. It works excellent for a couple seconds, and then gets quieter. For some reason, the piston keeps pushing the grease down inside into a huge glob and then stops pumping air since there isn't any seal. Can anyone help?

Thanks,
Trevor