Here’s mine made from a spade bit in 3 minutes with the belt sander.
Fits a 9/32 through hole and also runs backwards.
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| Installing a pickup jack in 1 1/8" thick tail block. http://mowrystrings.luthiersforum.com/forum/viewtopic.php?f=10101&t=55742 |
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| Author: | guitarjtb [ Tue Jun 27, 2023 9:12 am ] |
| Post subject: | Installing a pickup jack in 1 1/8" thick tail block. |
A customer is asking about solutions for a pickup jack in his Harmony Sovereign. I seldom work with pickups. Harmony Sovereign tail blocks are 1 1/8" thick. Martin tail blocks are typically around 3/4" Will most pickup jacks work with a tail block that is 1 1/8" thick? Or, do you need to counter bore the hole inside, so that the threads will reach. Does anyone make an extender that will fit most of pickups that won't work with a thick tail block? |
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| Author: | Colin North [ Tue Jun 27, 2023 10:06 am ] |
| Post subject: | Re: Installing a pickup jack in 1 1/8" thick tail block. |
I just counterbore the hole inside. I've made a counterbore by filing/grinding a spade bit in the past, you don't need to buy one if it's just a one-off. Drill a hole to suit the spade bit shaft first, counterbore to suit, then ream out the hole for the jack with a stepped reamer. Metric usually suits at 12mm but check yours first. |
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| Author: | bcombs510 [ Tue Jun 27, 2023 10:09 am ] |
| Post subject: | Re: Installing a pickup jack in 1 1/8" thick tail block. |
Here’s a thread with some details about the spade bit counterbore that Colin described. Countersink From Inside Closed Body? https://r.tapatalk.com/shareLink/topic? ... source=app Sent from my iPhone using Tapatalk Pro |
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| Author: | Hesh [ Tue Jun 27, 2023 12:26 pm ] |
| Post subject: | Re: Installing a pickup jack in 1 1/8" thick tail block. |
We use a counter boar that we made. Guilds from the past can have very thick tail blocks too. |
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| Author: | Alan Carruth [ Tue Jun 27, 2023 2:00 pm ] |
| Post subject: | Re: Installing a pickup jack in 1 1/8" thick tail block. |
I've done the same thing as Colin, but I made my counter bore from a Forstner bit. It makes a smoother hole. You have to run it backwards, of course... |
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| Author: | guitarjtb [ Tue Jun 27, 2023 3:17 pm ] |
| Post subject: | Re: Installing a pickup jack in 1 1/8" thick tail block. |
Will any pickup jacks work with a tail block that is 1 1/8" thick? What is the max thickness that most pickups will work in? I have a home made reverse counter bore, that I made from a spade bit, but the customer is in Canada. I am in AL |
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| Author: | guitarjtb [ Tue Jun 27, 2023 3:19 pm ] |
| Post subject: | Re: Installing a pickup jack in 1 1/8" thick tail block. |
Does anyone make an extender that will fit most of pickups that won't work with a thick tail block? |
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| Author: | Hesh [ Tue Jun 27, 2023 5:20 pm ] |
| Post subject: | Re: Installing a pickup jack in 1 1/8" thick tail block. |
guitarjtb wrote: Does anyone make an extender that will fit most of pickups that won't work with a thick tail block? I think you will have to counterbore we did and do. I'm unaware of any extenders and even if they exist we didn't go that route which tells me it's not necessary or advisable. Our's is made from a Forstner bit like Alan's also run backwards. There is a bit of an investment in the tooling to do one of these or Guilds if you only ever will do one of them but it gets the job done nicely. We use our counterbore several times a year so the costs and time are sunk for us. |
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| Author: | meddlingfool [ Tue Jun 27, 2023 5:41 pm ] |
| Post subject: | Re: Installing a pickup jack in 1 1/8" thick tail block. |
Here’s mine made from a spade bit in 3 minutes with the belt sander. Fits a 9/32 through hole and also runs backwards.
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| Author: | Terence Kennedy [ Tue Jun 27, 2023 6:46 pm ] |
| Post subject: | Re: Installing a pickup jack in 1 1/8" thick tail block. |
I’ve always used a reverse spotfacer. A centering bushing if needed can help keep chatter down and get a cleaner recess. |
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| Author: | dzsmith [ Tue Jun 27, 2023 8:37 pm ] |
| Post subject: | Re: Installing a pickup jack in 1 1/8" thick tail block. |
I used one of the long threaded jacks stewmac sold. I ended up having to buy the weird sized tap to create the threads. Drill, tap, and screw the jack in. Easy but expensive. |
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| Author: | Colin North [ Wed Jun 28, 2023 3:14 am ] |
| Post subject: | Re: Installing a pickup jack in 1 1/8" thick tail block. |
Quote: also runs backwards. Depends on which way you grind it ... ![[:Y:]](./images/smilies/smiley20.gif "Thumbs Up")
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