Real newbie: thumb shifters and tire valve questions

zedzed
zedzed Posts: 55
edited October 2012 in Road beginners
Hi,
2 quickies .....

1. 2nd hand Spec Allez with thumb shifters ... How do I go down to lower gears? On quick test when buying bike I only went up and taking a look the 'trigger' it doesn't go in both directions ... Any advice appreciated! Need to take bike out and have a play I guess but I've had a chest infection so stik indoors!
2. Tire was a little flat so went to pump it up. Cap off and I unscrew the little nut at the top. At this point the screw in the valve gets wobbly and ultimately drops into the valve. It doesn't seem right and I can't get MTB pump to attach. What am I doing wrong?

Thanks in advance!
Dez

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