Avo's which have been in storage

[Ben]

I bought some AVO GTZ's about 18months ago, used them for a month, and then stuck them in the garage. Bit of a waste of money I know but I kept them because I plan on getting another 306 in 2015.

Anyway, I moved them into the loft today and noticed that one of them does not move very freely. It pushes in reasonably easily but is almost impossible to pull back out again. The other one pushes in easily and then pulls out similarly easily.

Does anyone have any idea as to what I could do to free it up? Don't want to have to send almost brand new coilies off for a refurb before I can use them next year!