Barlow len setup query - Skywatcher 200p

[Vik1]

Hi 

I am a total newbie let me just make that clear

Can someone tell me if this below setup is correct? I am having trouble fitting the black plastic part in as can be seen in the below image. If I take the black plastic part off then it simply slides in and I can lock it into place but then I have no lens?

[ScottS]

Have you not still got the cap on the Barlow there?

[Vik1]

Have you not still got the cap on the Barlow there?

wow I feel so dumb. The plastic lid was on so tight though to be fair that it just looked like one part. I thought the tiny hole there was to increase focus or something of that sort....

Thanks a ton!

[ScottS]

There you go. Mystery solved. Actually the cap on my Barlow is extremely tight also. I think the small hole may be there to let air in so you can get the cap off.