I second the Vibramate suggestion. With a Vibramate you can NOT use an import/licesnsed Bigsby (B50/B70), the holes are in different places. Vibramate intentionally does not offer them for imports. I'd like to think they have a good reason behind it, since it'd be so easy to move some screw holes and produce the additional product.
I used a Vibramate B5 (Yes a B5!) on my LP Ultra III and haven't regretted it. Contrary to popular mythos - I experienced additional desirable tone, increased sustain, and no have no tuning issues after installing my Bigsby. I also installed a brass roller bridge vs the stock zinc bridge, installed locking locking tuners, and occasionally lubricate my nut with some Dr.Duck's. I will suggest doing the same if you decide to take the bigsby plunge, as I can use mine and return to pitch without fail. Stewmac and Guitarfetish both sell the roller bridge i reccomend. I've purchased from both and they ship the exact same part, a Wilkinson Brass Rollerbridge. The posts will screw right into your existing bushings on the Wilshire. I only suggest ordering it from StewMac if you're already ordering something from them, it's about $10 cheaper from GuitarFetish. You may curse stringing, I'll suggest a stringray vs the spoiler if you decide to get a tool to assist. There is also the Callaham part that makes the string roller a string through.
The cost between a B5 and a B50 is less than $20. I don't suggest cheaping on the B5 vs the B50 for the small cost savings. That little extra gets a USA made part, better overall construction, handmade vs die cast, and compatibility with aftermarket products. The ease of reselling a guitarcan will go down with a Bigsby installed (often you'll not get the money back from the investment). You may also find you just don't like it. If you've drilled - you're screwed (pardon the pun). Another reason for my seconding of the Vibramate suggestion. It's a $50 installation tool that will pay for itself in saved time alone. I took 10 min over a string change to install it. It includes both Metric and STD screws for your bushings so you're covered there. If you decide you like it, and really, really, want to... you can remove the vibramate and drill. If you decide you don't like it - you can remove the entire kit from your guitar and return everything with zero damage to your guitar.
I used a Vibramate B5 (Yes a B5!) on my LP Ultra III and haven't regretted it. Contrary to popular mythos - I experienced additional desirable tone, increased sustain, and no have no tuning issues after installing my Bigsby. I also installed a brass roller bridge vs the stock zinc bridge, installed locking locking tuners, and occasionally lubricate my nut with some Dr.Duck's. I will suggest doing the same if you decide to take the bigsby plunge, as I can use mine and return to pitch without fail. Stewmac and Guitarfetish both sell the roller bridge i reccomend. I've purchased from both and they ship the exact same part, a Wilkinson Brass Rollerbridge. The posts will screw right into your existing bushings on the Wilshire. I only suggest ordering it from StewMac if you're already ordering something from them, it's about $10 cheaper from GuitarFetish. You may curse stringing, I'll suggest a stringray vs the spoiler if you decide to get a tool to assist. There is also the Callaham part that makes the string roller a string through.
The cost between a B5 and a B50 is less than $20. I don't suggest cheaping on the B5 vs the B50 for the small cost savings. That little extra gets a USA made part, better overall construction, handmade vs die cast, and compatibility with aftermarket products. The ease of reselling a guitar
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