Shimano LX Front Mech adjustment.

Hey,
I recently got my bike serviced and they replaced the rear mech cable, and as I was anticipating it's stretched. Today I tuned it up and it seems to be shifting nicely, however the front mech started dragging.
My front mech is a Shimano LX with rapidfire shifters. I've read and understand the theory of how to adjust them using the High/Low screws to adjust the position of the cage in the top/bottom chainring, however they apparently have no effect. It's not marked which is high and which is low, but after quite a long time fiddling about I notice no perceptible difference by sight, feeling the cage while turning the screws, nor in actual shifting. I ended up taking the cable out and screwing the thing royally but I managed to patch it up by just adjusting the cable tension at the allen bolt by the mech. However, it still drags.
Am I doing something wrong? Is my mech broken? Surely there should be some noticeable effect in my adjustment of the screws or is it ridiculously subtle?
I recently got my bike serviced and they replaced the rear mech cable, and as I was anticipating it's stretched. Today I tuned it up and it seems to be shifting nicely, however the front mech started dragging.
My front mech is a Shimano LX with rapidfire shifters. I've read and understand the theory of how to adjust them using the High/Low screws to adjust the position of the cage in the top/bottom chainring, however they apparently have no effect. It's not marked which is high and which is low, but after quite a long time fiddling about I notice no perceptible difference by sight, feeling the cage while turning the screws, nor in actual shifting. I ended up taking the cable out and screwing the thing royally but I managed to patch it up by just adjusting the cable tension at the allen bolt by the mech. However, it still drags.
Am I doing something wrong? Is my mech broken? Surely there should be some noticeable effect in my adjustment of the screws or is it ridiculously subtle?
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Have a read of the info on parktools.
Parktools :?:SheldonBrown