Gene_SC - 4/8/2010 3:37 PM
I saw that VMachkit I thinkon TW Chambers sight. Thought about buying another HW but the 77 and trying out that kit. I think they offer a couple different versions as well.
Must have been someplace else Gene. The kit on the TW Chambers site is their kit... I bought one and I think that after you read below, you might want to reconsider buying one... unless you just have an overwhelming curiosity.
The T.W. Chambers "Ultra Premium" kit contains the following:
1. A clear, thin bodied, golden color oil product (containing PTFE... "shake well before using") called "Ultra lube". This lube is recommended for the piston (only) and sliding compression chamber, as well as the spring ends. It has the viscosity of a 10 or 20 wt motor oil.
2. A heavy black grease product made from lithium and moly... shockingly enough, called "Ultra grease". This is recommended for use on the spring coils only. This is about the consistency of JM moly paste... perhaps a bit thinner and quite "sticky".
3. A spring... 10.625" in length, which is rectangular in wire cross-section with slightly radiused "corners" and nicely finished ends. Appears to be made by OX as they are the only square wire spring makers I'm aware of.
4. Seals. A white parachute type piston seal and a clearish replacement breech seal. They appear to be OE parts.
5. Spring guides. A front (piston) spring guide or tophat and a rear guide/cocking shaft sleeve with a little thicker base shoulder than the stock steel two-piece guide assembly. Both guides are made of a green nylon material and will free turn in the spring, but otherwise have no radial clearance.
So... what we have is an OX or OX type square spring, some nylon guides and a lubrication protocol that doesn't jive with anything I've ever seen. I installed the entire kit, but deviated from their instructions, using the Chambers moly on the piston and Macarri tar on the spring.
In side by side testing, there was no real improvement over a properly lubed but otherwise stock HW97K. Velocities are nearly identical, and if anything, the shot cycle in the stock gun is slightly quieter. Chances are I'll be removing the kit spring and rear guide at some point and reinstalling the stock parts.
Cheers,
C