Newbie Alert!

Hello,
I have just joined the site and would like to say Hello to Everyone !
(great website)

I am new to Pentax cameras and will probably be seeking lots of help of over the coming months....please bare with me....thank you

I have been into photography for a few years and have produced some lovely pictures (especially macro shots), just by using my little digital fuji finepix (4 megapixels).

I am now the proud owner of a pentax camera and three lenses....(sorry to be basic, but i havent studied them enough to know the names etcs....i only got them yesterday)
Acquired from a dear friend whose husband passed away last year. The images he has taken with this equipment are fantastic and I hope i can do it some justice !

One of the lenses has a cover piece missing off the body, that would normally switch between settings.....all that is visible is a very small little circuit, which i am worried will get dusty or damaged...Does anyone know where I can but spares online? I would be very grateful of any help you can give me....

Thank you