SMLE Bolt Head Underturn

[jmoore]

NEVER remove material from the front face or the rear of the threaded tenon of a bolt head.

The very rear of the bolt head , no. The front face? Perfectly normal for SMLEs. Have done quite a few. Having a barrel full of SMLEs missing all sorts of parts that I swapped perfectly good M60 parts to obtain. Was something over 50, but lost track.

Not No.4s, though. No cutting.

In my piles of SMLE bolt heads there have been some so long that they would not fit the most clapped out action imaginable. Since these heads had no small bits installed, nor any signs of use, I reckon they were NOS spares.

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[Homer]

[

Agreed. I've removed material from the bolt face on occasion, I thought it was common practice.



QUOTE=jmoore;289838]The very rear of the bolt head , no. The front face? Perfectly normal for SMLEs. Have done quite a few. Having a barrel full of SMLEs missing all sorts of parts that I swapped perfectly good M60 parts to obtain. Was something over 50, but lost track.

Not No.4s, though. No cutting.

In my piles of SMLE bolt heads there have been some so long that they would not fit the most clapped out action imaginable. Since these heads had no small bits installed, nor any signs of use, I reckon they were NOS spares.[/QUOTE]

[gc1054]

The very rear of the bolt head , no. The front face? Perfectly normal for SMLEs. Have done quite a few. Having a barrel full of SMLEs missing all sorts of parts that I swapped perfectly good M60 parts to obtain. Was something over 50, but lost track.

Not No.4s, though. No cutting.

In my piles of SMLE bolt heads there have been some so long that they would not fit the most clapped out action imaginable. Since these heads had no small bits installed, nor any signs of use, I reckon they were NOS spares.

Hmmm ......just scheduled the bolt head shoulders skim cut job with the machine shop today......BUT...... If the shoulder at the rear of the bolt head (where the thread on the tenon ends and which surface contacts the "face"of the bolt body when the bolt head is screwed in all the way) is not to be adjusted (skim cut or whatever method is chosen) how is the under turn to be resolved? It appears to be a given that the bolt head face (striker end side) can be adjusted to address CHS. And it seems that the bolt head tenon length can be adjusted to address striker protrusion while maintaining cocking piece lift dims. Is there another way to correct the under turn besides sifting through a bin of bolt heads? Does the radial location of the start thread on the tenon play any part in this problem (brainstorming or rambling...take your pick since the goal is to have the bolt head align with the recoil lug when it is fully screwed in?
Thanks!
GC