Parker barrel wedge

[Autumn Daze]

The conversion from a non replacable bolt plate to a replacable bolt plate is not for a hobbiest. If not properly fitted there will be all kinds of problems. One such symptom is what Brian is describing with the bolt sticking if the top lever is allowed to snap shut. This means that the 12 1/2 degree angle that the bolt operates on is just not quite right causing the bolt to lock on the bolt plate. There are three different types of bolts. First is the non replacable,second is the replacable with a full width bite and the third and latest is a replacable bolt with the two sides relieved. As far as the bolts go they are all the same profile.Just an angle cut at the 12 1/2 degrees.

[Bruce Day]

Originally Posted by Dave Suponski

..... As far as the bolts go they are all the same profile.Just an angle cut at the 12 1/2 degrees.No channels.

From the 1936 Parker Skilled Hands catalog. The illustration shows the particular form for the side channel bolt plate/ bolt mating interface. The side channels in the bolt plate are gripped by the side ridges in the mating bolt and fit within the machined recess in the lock bolt. This bolt plate/bolt is the 1910 patent version and is the third iteration of the lock system. This is why a gun with either no bolt plate or the flat R & R bolt of the 1905 version cannot be simply changed to include the 1910 bolt plate without also changing the bolt.

While I have not seen the function of the side channels/side ridges interface discussed in the Parker literature, I assume that it provides lateral stability, but I am not a degreed mechanical engineer or certified machinist.

Although these photos are from pages of the Skilled Hands catalog, I believe the same photos are reproduced in TPS, I haven't checked.

Bruce Day, Parker novice hoping to advance to second class

[Autumn Daze]

A bolt without the channels can be used with a bolt plate with the recesses cut into the sides just not the other way around. That is what I was trying to say....my bad.