For replacement of damaged, broken or missing hammer butt springs in most full size spinet pianos.  When measuring your old springs take note if the curve in them has "straightened" over the years - the spring in the photo is new and has a fairly pronounced curve (which can be tweaked as needed to change strength).  These are "short" length springs, about 1-1/8" from coil to tip that contacts hammer butt, 0.025" diameter wire.

We also offer the longer, 2" springs, check my eBay store, item # 291932630877 and 1 3/4" springs item #291932617671.

I've been a full time piano technician for 30+ years and am glad to help answer questions before or after the sale.  My contact info is included in each shipment and you can also reach me through eBay.