New: Take part in the April 2020 Giveaway for a brand new GIORDANO™ bicycle

Welcome guest! Register or sign in to participate in the cycling discussions.

Tightening SL-M570 Thumb Lever
I have a Shimano Deore SL-M570 shifter (circa '00) that has a lot of up and down play in the thumb lever for the front derailer. Unless I press the thumb lever upward toward the body of the shifter, the loose condition causes it to miss the pawl to shift from the second to the third chain ring. If I open up the bottom cover on the shifter, it would appear that it can be tightened by the hex bolt that is visible, but there is a small metal plate underneath it, with two tabs that stick up on two sides of the bolt, apparently preventing it from turning (see picture here). Is this, indeed, how to tighten the thumb lever, and if so, how can I tighten it with those metal tabs in place?


[Image: view?usp=sharing]
I presume the tabs are there to prevent the bolt turning from the rotation of the shifter. You may be able to bend the tabs down, tighten, and then bend back up.
It sounds to me that the shifter is worn out, They are not meant to be taken part further than removing plastic covers. however the way I see it as it is broke already so go for it and see what happens. I have had older models torn down to a pile of parts and springs before and assembled back to functioning shifters again.
There are two kinds of people in the world, "Those who help themselves to people, and those who help people!"

Possibly Related Threads...
Thread Author Replies Views Last Post
  Switching from Racing Shifters to Thumb Shifters! JusFoolin 10 13,892 06-29-2015, 08:22 AM
Last Post: JusFoolin
  Upgrading gears: friction to indexed thumb levers? MikZ 5 6,544 11-02-2014, 11:52 PM
Last Post: MikZ
  Need help re-tightening bicycle crank loldamar 2 4,352 04-13-2014, 05:56 AM
Last Post: loldamar
  How to change Gear levers from Thumb Shifters to STI? Ciaránou 2 8,634 02-23-2014, 04:25 PM
Last Post: nfmisso
  The Feel of Stem Mounted Thumb Shifters snizz 2 7,088 06-10-2013, 06:46 AM
Last Post: redfoxglove
  Rear wheel gets tightened with tightening the nuts generous88 3 9,119 05-31-2012, 01:52 PM
Last Post: trevgbb
  Next cone tightening nextmatt 2 5,562 07-31-2011, 03:04 AM
Last Post: nextmatt
  Cone tightening busymate 7 13,203 01-06-2011, 02:34 PM
Last Post: sidmarx
  Deep dish carbon wheel spoke tightening doughavlin 10 17,422 05-15-2010, 06:54 PM
Last Post: Joe_W
  Spinning pedals; non-functioning thumb shifter Meggers75 5 8,789 03-27-2010, 07:08 PM
Last Post: ejhern

Forum Jump: