I'm changing my "junk" Ibanez srx 690e tuning pegs to precision open pegs,but I'm ordering a set for $8.99 from Amazon and can't find a template to figure how much of the mounting I most probably will have to grind off to fit headstock. Ibanez srx has narrow headstock and at least 2 posts are going to be close to edge and precision tuners will hang over a little. What I found was 50mmx39mm. A lot bigger than the cheap gotoh sealed tuners. Any help would be appreciated. Cant afford better,limited income.