R button weirdness

[xtakkun]

I recently took apart my psp to try to clean the umd drive. After putting it back together and starting it up I noticed that for any thing requiring the R button it acts like it is permanently pushed down even though it's not. I have it open in front of me right now and have cleaned the little input thing and even lifted it and it still does this. Do I have to replace the whole button input sensor or is it something fixable? 

[siritchy]

I am having the exact same problem.  Any suggestions?

[Nevbox]

If it stuck down or can you pull it up (loose)

[whitetop]

you did put it in the hole right and put the rubber in right as well?