To change this cassette, I'm guessing I need two chain whips. After that, I'd like to change the bigger cogs from about 22-24 to 26- 28. Do I need Uniglide specific cogs or will other 7-speed or even 8-speed cogs work? The bike also has Biopace crank rings of 52 / 42. Will an 8-speed 38 tooth inner cog swap OK for the 42? Another question - are the old Uniglide specific chains necessary for this cassette? Thanks for any help.