I have a couple of guitars that have the Fender Ultra tremolo bridge installed; these have a slightly thicker bar than the other bridges by Fender, Gotoh/Wilkinson, etc. The Ultra bridges don��t come with a plastic tip, and there��s no way to buy one for that size tremolo bar. I ordered this for one such bridge, and after a little experimenting I was able to modify it to fit the bar. Get something grippy to hold onto it (I used one of those jar lid opener pads) and hold it tight while you insert a 7/32�� drill bit into it. Bore out the opening with the bit, and it will now fit the thicker tremolo bar while still having enough friction to stay put.