It may be worth seeing of you can get some longer post inserts. The longer the insert, the lower the average pressure on the soft pine. You'll want ones with an M8 thread and a 12mm outside diameter I find an 11.5mm drill works best with them.
The non-splined section is 11.5mm in diameter, with 12mm being pretty much the spline diameter. With a 12mm hole, there isn't much wood for the inserts to grip.
Alternatively, the screwed M8 nut inserts might be better for pine, certainly in terms of reducing any risk of a pull out, though they generally use a smaller hole. Something like this (but more locally sourced): https://www.amazon.co.uk/Alloy-Furni...iy&sr=1-4&th=1
You need to find ones (like those ones I found) where the hex key insert at the top isn't too deep, otherwise you can end up with very little of the bridge post screwed in if it's set quite high. Also, 25mm long are preferable to 20mm.
Last edited by Simon Barden; 01-12-2020 at 06:38 PM.
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