Hi all..

I'm after some help. I've just purchased a set of 'used' (but supposedly only 6 - 7 times) Sierra Scale Retracts for a 1/5 scale MkV Tempest. Tried to test them today and found them fairly 'stiff' and reluctant to retract or extend .. We gave them a light oil with transmission fluid with not much of a positive effect.

I'm new to 'BIG' models and the friend who is assisting me in my project and who has experience in 'large scale' models suggested taking the Air cylinder apart. His thinking is that perhaps the rubber 'o' rings within the cylinder could be perished and need replacing.. I've dismantled the unit and removed the cylinder but am unable to see how it can be taken apart to renew/maintain whatever there may be inside. I have a 'watchmakers' eyeglass and even with it am unable to see a screw thread at one end where perhaps the cylinder screws into itself. Is the end cap a 'press' fit with some type of glue? Do I need to apply heat (I did a little but still no good and didn't want to over do that)..

Any advice will be most welcome!

Thanks,

Bruce Hoffmann