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Pickup foam?

I just finished my first ever pickup install. I put a set of Model Js in my Jazz. Went okay and sounds great but I have a question. Dimarzio says to cut a piece of the foam that comes with the pickups to put underneath and not to use the existing foam because their pickups are taller than normal and there's less room for the foam. Okay, I did that. My question is, should I be able to push down on the pickup and feel it move? I rest my thumb on the pickup most of the time and I never noticed my old pickup moving when I did that. Maybe I need to put more foam underneath?
 
Since I very rarely adjust a pickup's height once it's where I want it, I use a foam with more density than the spongy stuff. I've found that yoga matting that's about 1/8" thick works the best.....there's a litte give, but not much. On one of my basses I had to use two thicknesses to get the desired height.
 
I prefer to use springs as foam decays over time, making a mess.

MosesPBass15a.jpg



I didn't route that Jazz cavity, BTW. Or maybe I should say hack that cavity. Anyway, I'm probably changing it out to put a MM pickup in it.
 
under the right circumstances, springs can get noisy. Some of the G&L guys replace their springs with foam. On suspended pickups like humbuckers, mini humbuckers, Tele neck pickups, etc I generally replace the typical springs with surgical tubing.

Personally I use a combination of 1/8th inch non-stick weather strip and approx 1/4 inch mouse pad. None of that has degraded for me. I think the quality of the foam varies ...
 
I just replaced my foam with spring clips used in aluminum picture framing. They have a range of completely flat to about 3/4", retain their "springativity", and can be had for cheap. It only takes one for each pickup and you can cut them in half for P-Bass style cavities. Just remove the old foam and drop one of these in each cavity.

Back when I was doing framing, I always had extras that I threw away when I put together small frames. You can probably get a couple for free at a local frame shop for the asking.
 

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Wow 2009... hello from 2022.

Pickup foam. High density foam the kind of foam that pick ups are shipped in. Fashion a hunk to match the shape of the offending and deteriorated old foam, no sticky or double sided tape needed. It crushes nicely. Place in cavity, pickup on top and put the screws to it... proceed with adjustment.

I use the 2 nickles/1 nickle for height adjustments. Nickles are roughly ⅛ inch thick. Weatherstripping is okay, but I don't think it is quite thick enough.