When you shop for a hand tool, the first decision is not which brand to buy, but which job you are about to do. These four options are all hand tools, yet they split into two very different worlds: engine repair and vintage woodworking. One punch is made for valve guide installation and removal. One gauge is built to check rod bolt stretch. The remaining two are the same Stanley 78 rebate plane spur and screw, a spare part for restoring an old plane. Because they are not interchangeable, the useful approach is to match each tool to a specific project rather than treat them as competitors.
Quick Take
Before you compare prices, decide which project is on your bench. If you are doing cylinder head work, the Valve Guide Punch Tool is the only item here aimed at guide installation and removal. If you are assembling an engine and want to measure rod bolt stretch, the Proform Parts 66788 Tool is the only measuring gauge. If you are restoring a Stanley 78 rebate plane, the two Vintage Stanley 78 spur and screw versions are essentially the same spare part, so they compete with each other, not with the engine tools.
Listed Price Comparison
| Product | Listed Price | Price Bar | What It Is |
|---|---|---|---|
| Valve Guide Punch Tool | USD 18.99 | Universal valve guide installation and removal tool | |
| Proform Parts 66788 Tool | USD 94.55 | Rod bolt stretch gauge with 0.001-inch dial | |
| Vintage Stanley 78 Spur & Screw (First Version) | USD 13.47 | Vintage original spare for a Stanley 78 rebate plane | |
| Vintage Stanley 78 Spur & Screw (Second Version) | USD 13.17 | Same vintage original spare in a separate version |
Decision Matrix
- Valve guide service: Choose the Valve Guide Punch Tool. It is the only product here designed for installing and removing compatible engine valve guides during cylinder head repairs.
- Rod bolt stretch check: Choose the Proform Parts 66788 Tool. It is the only measuring tool in the group and is intended to sit on the bolt while you tighten it.
- Stanley 78 plane restoration: Choose either Vintage Stanley 78 spur and screw version. They share the same replacement part, so let the photos guide you rather than overthinking a small price gap.
Product Notes
Valve Guide Punch Tool
At USD 18.99, this punch is the only tool in the roundup dedicated to engine valve guide work. It is designed for installation and removal of compatible valve guides, and its material is 40 chrome vanadium steel with induction hardening. That makes it a sensible go-to when you are replacing guides during a cylinder head repair. The limitation is that it is a single-purpose tool aimed at valve guide service, so it is not the right companion for rod bolt stretch checks or woodworking plane restoration. If your project is not valve guide service, this punch will likely sit unused in the drawer.
Proform Parts 66788 Tool
At USD 94.55, the Proform Parts 66788 Tool is the only measuring gauge in this comparison. It is a rod bolt stretch gauge, not a general-purpose hand tool. The dial reads in 0.001-inch increments, and the design keeps the gauge on the bolt while you tighten it, with adjustment for bolts up to 2.75 inches long. If you build engines and want to compare rod bolt readings before and after torquing, this is the tool that fits that job. The trade-off is its price and narrow focus: you would only reach for it during engine assembly, and you still need the manufacturer's specification to interpret the readings.
Vintage Stanley 78 Spur & Screw (First Version)
At USD 13.47, this version of the Stanley 78 spur and screw is a genuine spare part in used condition, best treated as a restoration component rather than a new purchase. For someone who already owns a Stanley 78 rebate plane and needs the missing Catalogue Part L spur and screw, this is a direct way to get an original Stanley-made part. The limitation is that this is only a component: without the rest of the plane, it has no standalone use. It is also a used item, so the condition shown in the photos should be part of your decision.
Vintage Stanley 78 Spur & Screw (Second Version)
At USD 13.17, the second version of the Stanley 78 spur and screw is a genuine Stanley part made in Sheffield, England. Like its counterpart, it is a used original spare for the Stanley 78 rebate plane, and it is likely to appeal to the same woodworking restorer. Because the two Stanley versions are nearly the same component, the main reason to pick this one is the slightly lower price. The limitation remains the same: this is a spur and screw only, not a complete plane. If you do not have a Stanley 78 body to attach it to, the spare cannot do any cutting or rebating on its own.
Final Recommendation by Use Case
- For valve guide installation or removal, pick the Valve Guide Punch Tool. It is the only option built around that task.
- For rod bolt stretch measurement during engine assembly, pick the Proform Parts 66788 Tool. It is the only gauge in this group and matches the job exactly.
- For Stanley 78 rebate plane restoration, pick whichever Vintage Stanley 78 spur and screw version has the condition you prefer from the photos; the two versions are the same spare part, so you are choosing between nearly identical replacements.
