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31MM vs 30MM cartridge

Discussion in 'Fisher Engineering Discussion' started by buddymanzpop, Oct 15, 2010.

  1. buddymanzpop

    buddymanzpop Senior Member
    Messages: 603

    Fisher and Western are both Douglas Dynamic products, why does fisher use a 31 MM cartridge as the #2 cartridge on the Insta Act, and Western uses a 30MM cartridge on their similar set up? Can these be inter-changed ?