ORIGINAL: w8ye
If anyone is going to start playing with the needle taper, they best have some extra needles on hand.
I think I said much the same in post#35.
The cost of a needle is often less than the cost of a glow plug. I also recommend that one have a full set of glow plugs that span a large range of heat ranges. One does need to make a bit of a commitment to this sport/hobby to get the MOST from it. A few glow plugs, needles and a tachometer are the minimum one should have.
All the best,
Konrad