I had a similar problem on out ND 32-982. Carbon blocks are available from various sources on the web. I attached the purchased block to the original copper arm the after drilling and tapped a hole in the block. It's been working for about bout three years,. I last checked it a couple of months ago on our last haul. Ron -----Original Message----- From: sentoa-request@lists.sentoa.org <sentoa-request@lists.sentoa.org> Sent: Friday, June 13, 2025 7:20 AM To: sentoa@lists.sentoa.org Subject: Sentoa Digest, Vol 169, Issue 9 Send Sentoa mailing list submissions to sentoa@lists.sentoa.org To subscribe or unsubscribe via email, send a message with subject or body 'help' to sentoa-request@lists.sentoa.org You can reach the person managing the list at sentoa-owner@lists.sentoa.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Sentoa digest..." Today's Topics: 1. Propeller Shaft Brush Replacement (Stephen Paul) 2. Re: Propeller Shaft Brush Replacement (Dave Sire) ---------------------------------------------------------------------- Message: 1 Date: Fri, 13 Jun 2025 09:47:31 -0400 From: Stephen Paul <sc.paul@me.com> Subject: [Sentoa] Propeller Shaft Brush Replacement To: sentoa@lists.sentoa.org Message-ID: <D5EE1218-617F-4700-9B69-5939DCB18E1C@me.com> Content-Type: multipart/alternative; boundary="Apple-Mail=_8D96DF49-16C0-4FDA-8BB5-28269E1CBCC7" NT37-203 was outfitted by the factory with a ProMariner (Model 20035) shaft brush, installed to ride on the tug’s 2” diameter shaft. That device proved over time to be a high failure rate item, with the graphite brush attachment falling off about every year. I eventually learned to apply an epoxy bead around the base of the graphite brush attachment to the bronze strap. This proved to hold up well, with the last one surviving for 6 years. Unfortunately, my marina broke the graphite brush off this year in the course of removing/reinstalling the propeller shaft (for the PSS shaft seal bellows replacement). I have installed an on-board spare of the ProMariner device, so all is well for now. However, when I sought to replenish the spares inventory, I learned that the ProMariner 20035 product is no longer available. I confirmed with the successor company (Navico Group) that the product is no longer offered. Search for a comparable product has led only to the Electro-Guard HD-SB Propellor Shaft Wiper Brush Assembly (https://www.boatcorrosion.com/product-shaft-wiper-assemblies.html), as sold by Sure Marine Service, Inc. But the product description indicates a limitation of shaft diameters up to 1.5”. I confirmed with the manufacturer that the product size limitation is valid, for the reason that they consider the product to be marginally effective even at that shaft size! (The rep told me that they only continue to offer the product because distributors say customers continue to clamor for it.) I suspect that failure of the shaft brush assembly has been experienced by many. But I have not found any chatter about the unavailability of a replacement. So I would love to get some feedback on how, or if, others have addressed replacement of the propeller shaft brush assembly. Regards. Steve Paul Penny-wise NT37-203 828 Casterline Rd. Endicott, NY. 13760 C: 607.768.4024